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This industry leading coupler features plastic standard coupler with metal knuckle, and #621 torsion centering spring and comes complete with #233 insulated draft gearbox and lid. The #34 Magne-Matic® Plastic Coupler is designed mostly for body mounting with limited space either above or below the mounting platform, with or without Draft Gear Box Lid and with Draft Gearbox Lid either on top or bottom. Note: The 30-Series Torsion Spring can be mounted either below or above the coupler shank, but must always be mounted between the Coupler Spring Lid and Draft Gearbox. The #144 Whisker® Metal Coupler mounted in a #252 Snap-together Gearbox is equivalent to the #34 Coupler. The Whisker® Coupler mounted in a #252 Snap-together Gear box makes for simple and easy assembly. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. HO-Scale Package Includes: (2) Pair #34 Plastic Shank Couplers - Short Underset Shank (2) Pair #621 Torsion Centering Spring (2) Pair #233 Gearboxes & Lids (2) Pair #210 Washers (2) Pair #256 - 2-56 Screws (2) #622 Knuckle Springs #34 Plastic Coupler Features: Material  -   Metal Knuckle, Plastic Coupler Shank Shank Length  -   Short (1/4") (center hole to back of coupler head) Coupler Offset  -   Underset Knuckle Spring  -   #622 Centering System  -   Standard Shank Centering Spring  -   #621 Torsion Centering Spring Head  -   Standard Head Works With  -   #233 draft gearboxes #233 Plastic Draft Gearboxes & Lids Features: Material  -   Insulated Plastic Dimensions  -   3/8"L x 5/16"W x 9/64"H Works With  -   NO.5®, #58, 20-Series Couplers #34 in a #233 gearbox on top. Mounting Specifications: Mounting Height  -   29/64" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) #34 in a #233 gearbox on bottom. Mounting Specifications: Mounting Height  -   13/32" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) Recommended Tools: #206 Insulated Multi-Purpose Coupler Height Gauge #231 Greas-em Dry Graphite Lubricant #237 Coupler Trip Pin Pliers #240 Double Headed Pin Vise #241 Dual Tool Manual Uncoupling Tool and Spring Pick #246 Tap (2-56) and Drills (#50 and #43) #1020 Coupler & Special Purpose Tweezers  

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This industry leading coupler features plastic standard coupler with metal knuckle, and #621 torsion centering spring and comes complete with #233 insulated draft gearbox and lid. The #35 Magne-Matic® Plastic Coupler is designed mostly for body mounting with limited space either above or below the mounting platform, with or without Draft Gear Box Lid and with Draft Gearbox Lid either on top or bottom. Note: The 30-Series Torsion Spring can be mounted either below or above the coupler shank, but must always be mounted between the Coupler Spring Lid and Draft Gearbox. The #145 Whisker® Metal Coupler mounted in a #252 Snap-together Gearbox is equivalent to the #35 Coupler. The Whisker® Coupler mounted in a #252 Snap-together Gear box makes for simple and easy assembly. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage.   Two pair per package   Made in the U.S.A. HO-Scale Package Includes: (2) Pair #35 Plastic Shank Couplers - Short Overset Shank (2) Pair #621 Torsion Centering Spring (2) Pair #233 Gearboxes & Lids (2) Pair #210 Washers (2) Pair #256 - 2-56 Screws (2) #622 Knuckle Springs #35 Plastic Coupler Features: Material  -   Metal Knuckle, Plastic Coupler Shank Shank Length  -   Short (1/4") (center hole to back of coupler head) Coupler Offset  -   Overset Knuckle Spring  -   #622 Centering System  -   Standard Shank Centering Spring  -   #621 Torsion Centering Spring Head  -   Standard Head Works With  -   #233 draft gearboxes #233 Plastic Draft Gearboxes & Lids Features: Material  -   Insulated Plastic Dimensions  -   3/8"L x 5/16"W x 9/64"H Works With  -   NO.5®, #58, 20-Series Couplers #35 in a #233 gearbox on top. Mounting Specifications: Mounting Height  -   35/64" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) #35 in a #233 gearbox on bottom. Mounting Specifications: Mounting Height  -   1/2" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary)

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This industry leading coupler features plastic standard coupler with metal knuckle, and #621 torsion centering spring and comes complete with #233 insulated draft gearbox and lid. The #36 Magne-Matic® Plastic Coupler is designed mostly for body mounting with limited space either above or below the mounting platform, with or without Draft Gear Box Lid and with Draft Gearbox Lid either on top or bottom. Note: The 30-Series Torsion Spring can be mounted either below or above the coupler shank, but must always be mounted between the Coupler Spring Lid and Draft Gearbox. The #146 Whisker® Metal Coupler mounted in a #252 Snap-together Gearbox is equivalent to the #36 Coupler. The Whisker® Coupler mounted in a #252 Snap-together Gear box makes for simple and easy assembly. Other Whisker® Coupler #36 equivalent options include #156 Whisker® "Scale" Metal Coupler when mounted a #252 Snap-together Gearbox. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. HO-Scale Package Includes: (2) Pair #36 Plastic Shank Couplers - Long Centerset Shank (2) Pair #621 Torsion Centering Spring (2) Pair #233 Gearboxes & Lids (2) Pair #210 Washers (2) Pair #256 - 2-56 Screws (2) #622 Knuckle Springs #36 Plastic Coupler Features: Material  -   Metal Knuckle, Plastic Coupler Shank Shank Length  -   Long (25/64") (center hole to back of coupler head) Coupler Offset  -   Centerset Knuckle Spring  -   #622 Centering System  -   Standard Shank Centering Spring  -   #621 Torsion Centering Spring Head  -   Standard Head Works With  -   #233 draft gearboxes #233 Plastic Draft Gearboxes & Lids Features: Material  -   Insulated Plastic Dimensions  -   3/8"L x 5/16"W x 9/64"H Works With  -   NO.5®, #58, 20-Series Couplers #36 in a #233 gearbox on top. Mounting Specifications: Mounting Height  -   1/2" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) #36 in a #233 gearbox on bottom. Mounting Specifications: Mounting Height  -   29/64" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) Recommended Tools: #206 Insulated Multi-Purpose Coupler Height Gauge #231 Greas-em Dry Graphite Lubricant #237 Coupler Trip Pin Pliers #240 Double Headed Pin Vise #241 Dual Tool Manual Uncoupling Tool and Spring Pick #246 Tap (2-56) and Drills (#50 and #43) #1020 Coupler & Special Purpose Tweezers

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This industry leading coupler features plastic standard coupler with metal knuckle, and #621 torsion centering spring and comes complete with #233 insulated draft gearbox and lid. The #38 Magne-Matic® Plastic Coupler is designed mostly for body mounting with limited space either above or below the mounting platform, with or without Draft Gear Box Lid and with Draft Gearbox Lid either on top or bottom. Note: The 30-Series Torsion Spring can be mounted either below or above the coupler shank, but must always be mounted between the Coupler Spring Lid and Draft Gearbox. The #148 Whisker® Metal Coupler mounted in a #252 Snap-together Gearbox is equivalent to the #38 Coupler. The Whisker® Coupler mounted in a #252 Snap-together Gear box makes for simple and easy assembly. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage.   Two pair per package   Made in the U.S.A. HO-Scale Package Includes: (2) Pair #38 Plastic Shank Couplers - Medium Underset Shank (2) Pair #621 Torsion Centering Spring (2) Pair #233 Gearboxes & Lids (2) Pair #210 Washers (2) Pair #256 - 2-56 Screws (2) #622 Knuckle Springs #38 Plastic Coupler Features: Material  -   Metal Knuckle, Plastic Coupler Shank Shank Length  -   Medium (9/32") (center hole to back of coupler head) Coupler Offset  -   Underset Knuckle Spring  -   #622 Centering System  -   Standard Shank Centering Spring  -   #621 Torsion Centering Spring Head  -   Standard Head Works With  -   #233 draft gearboxes #233 Plastic Draft Gearboxes & Lids Features: Material  -   Insulated Plastic Dimensions  -   3/8"L x 5/16"W x 9/64"H Works With  -   NO.5®, #58, 20-Series Couplers #38 in a #233 gearbox on top. Mounting Specifications: Mounting Height  -   1/2" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) #38 in a #233 gearbox on bottom. Mounting Specifications: Mounting Height  -   29/64" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary)

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#442 Brake Pads - Wide Bolster - HO ScaleDetail Parts For use on Wide Truck Bolseters.170" W x .075" H truck bolster.120" clip opening.400" pad to pad Used on Kadee® 70 & 100 Ton Metal Fully Sprung; or 70 & 100 Ton "HGC" 2 Piece Trucks.(For use on #513, #518, #555, #558, #560, #566, #569, #570, #1560, #1566, #1569, #1570). HO-Scale Package Includes: (4) Each #442 Brake Pads - Wide Bolster

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This industry leading coupler features an all metal standard coupler, and #634 standard centering spring and comes complete with insulated draft gearbox and lid. The NO.5® Magne-Matic® Metal Coupler may be mounted with the included #232 Gearbox or with other manufacturers cast-on coupler pockets. The 148 Whisker® Coupler is equivalent to the NO.5® Metal Coupler. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. Use the provided insulated gearbox or insulated #28 coupler. HO-Scale Package Includes: (2) Pair NO.5® Metal Couplers - Medium Centerset Shank (2) Pair #634 Centering Spring NO.5® Style (2) Pair #232 Gearboxes (2) #622 Knuckle Springs NO.5® Metal Coupler Features: Material  -   Metal Shank Length  -   Medium (9/32") (center hole to back of coupler head) Coupler Offset  -   Centerset Knuckle Spring  -   #622 Centering System  -   Standard Shank Centering Spring  -   #634 Centering Spring NO.5® Style Head  -   Standard Head Works In Place of  -   #58, #28, #118, #119, #148, #158, most medium centerset "clone" couplers Works With  -   #213, #232, #234, #242, most manufacturer cast-on draft gearboxes #232 Plastic Draft Gearboxes & Lids Features: Material  -   Insulated Plastic Dimensions  -   29/64"L x 19/64"W x 7/64"H Works With  -   NO.5®, #58, 20-Series and all Whisker® Couplers Mounting Specifications: Mounting Height  -   29/64" Centerline  -   25/64" Trip Pin Height  -   1/32" Center Hole  -   2-56 Insulated Screws are the most commonly used. (Screw length will vary) Side Holes  -   0-48 Self-Tapping or 0-80 Machine Screws. (Screw length will vary) Recommended Tools: #206 Insulated Muti-Purpose Coupler Height Gauge #231 Greas-em Dry Graphite Lubricant #237 Coupler Trip Pin Pliers #240 Double Headed Pin Vise #241 Dual Tool Manual Uncoupling Tool and Spring Pick #246 Tap (2-56) and Drills (#50 and #43) #780 Tap (0-80) and Drills (#55 and #52)

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#503 Arch Bar Trucks with Ready-to-MountWhisker®Couplers, 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks TheWhisker®couplers will need to be assembled on to the trucks coupler bottom plate. Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Arch Bar Truck is typical of these trucks from around the turn of the century. Despite the age of these trucks, they saw more than seventy years of service in some applications. The arch bar was allowed in interchange service until about 1941. On railroads that were not common carriers such as logging or other industrial lines, this restriction of the trucks did not apply since the trucks did not operate on rails other than the owner's. The Northern Pacific, for example, used truss rod frame maintenance of way cars fitted with arch bar trucks well into the early 1970's. Many logging railroads also used them at least until then. HO-Scale Metal Fully Sprung Trucks Features: Ready-To-Mount #148 Metal Whisker® Couplers Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Package Includes: (2) Each #503 Arch Bar Trucks with Coupler Platform (assembled) (2) Each #148 Metal Whisker® Couplers (2) Each Coupler Gearbox (2) Each 0-48 Screw (2) Each Insulated Bushing (2) Each #209 Gray Insulating Fiber Washers .010" (2) #622 Knuckle Springs The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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#509 Andrews (1898) Trucks with 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Andrews truck is also a turn of the century design that was long lived. It represents one of the first steps in the development of the modern freight truck with its cast frame. The journal boxes are bolted to the main frame. This truck was used through the end of the 1950's although by that time was only used in lighter applications such as refrigerator cars. Andrews trucks are probably still used were logging railroads remain in operation. HO-Scale Metal Fully Sprung Trucks Features: Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Patent number 5,768,999 Package Includes: (2) Each #509 Andrews (1898) Trucks (assembled) The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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#511 Bettendorf T-Section Trucks with 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Bettendorf T-Section truck was introduced in the 1920's with a one piece cast sideframe. It had a life similar to the Andrews truck. HO-Scale Screws not included  Metal Fully Sprung Trucks Features: Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Patent number 5,768,999 Package Includes: (2) Each #511 Bettendorf T-Section Trucks (assembled) The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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#512 Bettendorf T-Section Trucks with Ready-to-MountWhisker®Couplers, 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks TheWhisker®couplers will need to be assembled on to the trucks coupler bottom plate. Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Bettendorf T-Section truck was introduced in the 1920's with a one piece cast sideframe. It had a life similar to the Andrews truck. HO-Scale Metal Fully Sprung Trucks Features: Ready-To-Mount #148 Metal Whisker® Couplers Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Package Includes: (2) Each #512 Bettendorf T-Section Trucks with Coupler Platform (assembled) (2) Each #148 Metal Whisker® Couplers (2) Each Coupler Gearbox (2) Each 0-48 Screw (2) Each Insulated Bushing (2) Each #209 Gray Insulating Fiber Washers .010" (2) #622 Knuckle Springs The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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#515 Vulcan Double Truss Trucks with 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Vulcan truck was introduced in the 1920's as another replacement for the arch bar truck. The Vulcan design incorporated a pin which held the journal box in place. Removal of the pin allowed the journal box to be quickly replaced. This truck lasted to the end of the steam era on mainline railroads and somewhat longer on logging railroads. HO-Scale Metal Fully Sprung Trucks Features: Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Patent number 5,768,999 Package Includes: (2) Each #515 Vulcan Double Truss Trucks (assembled) The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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#516 Vulcan Double Truss Trucks with Ready-to-MountWhisker®Couplers, 33" Ribbed Back Wheels - HO ScaleMetal Fully Sprung Equalized Trucks TheWhisker®couplers will need to be assembled on to the trucks coupler bottom plate. Mounts with a #2 or 2-56 screw.Mounting Screws not Included. The Vulcan truck was introduced in the 1920's as another replacement for the arch bar truck. The Vulcan design incorporated a pin which held the journal box in place. Removal of the pin allowed the journal box to be quickly replaced. This truck lasted to the end of the steam era on mainline railroads and somewhat longer on logging railroads. HO-Scale Metal Fully Sprung Trucks Features: Ready-To-Mount #148 Metal Whisker® Couplers Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Package Includes: (2) Each #516 Vulcan Double Truss Trucks with Coupler Platform (assembled) (2) Each #148 Metal Whisker® Couplers (2) Each Coupler Gearbox (2) Each 0-48 Screw (2) Each Insulated Bushing (2) Each #209 Gray Insulating Fiber Washers .010" (2) #622 Knuckle Springs The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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