Mobile / Universal

The Train Control Systems KA4-P Keep-Alive® is a compact stay-alive capacitor pack that feeds backup power to your DCC decoder whenever the wheels lose contact with the rails. No more stalling on dirty track, dead frogs, or insulated turnouts — the KA4-P keeps a locomotive running with its lights and sound on for roughly 6 to 20 seconds during a power interruption, depending on the locomotive and motor efficiency. This is the harness-equipped version: it ships with a 2-Pin Quick Connector Harness that plugs straight into any decoder with a compatible 2-pin Keep-Alive socket, such as the TCS T4 and other current TCS decoders — no soldering to the decoder required. Electrically it works in any scale, and its tiny .52" footprint tucks easily into HO and larger locomotives. Browse more decoder add-ons in our DCC Accessories collection, shop the full Train Control Systems lineup, or pair it with a new sound decoder from our DCC Decoders collection. Features Keep-Alive® stay-alive capacitor pack eliminates stalling on dirty track, dead frogs, and insulated rail joints. Powers an HO locomotive with headlights on for approximately 6–20 seconds during a power interruption. Includes a 2-Pin Quick Connector Harness — plugs into the TCS T4 and other decoders with a compatible 2-pin socket, no decoder soldering needed. Ultra-compact: just .52" x .52" x .45" (13.22 x 13.22 x 11.55 mm) — fits HO and larger locomotives. Works with any scale and any DCC system; pairs with TCS and most other-brand decoders that accept an external keep-alive. More Information Brand Train Control Systems (TCS) Item Number 2005 (KA4-P) Type Keep-Alive / Stay-Alive Capacitor Pack Connection 2-Pin Quick Connector Harness Dimensions .52" x .52" x .45" (13.22 x 13.22 x 11.55 mm) Hold-Up Time ~6–20 sec (HO, lights on) Scale Any Scale (HO and larger recommended) Condition New UPC 879508007848 FAQ What does a Keep-Alive actually do?It stores an electrical charge and feeds it to your decoder when track power drops out, so the locomotive keeps moving and its lights and sound stay on across dirty track, frogs, and gaps. Will the KA4-P plug into my decoder?The included 2-pin harness plugs into TCS decoders with a compatible Keep-Alive socket (such as the T4) and most current TCS decoders. For decoders without a 2-pin socket, you can solder the leads to the decoder's keep-alive pads — check your decoder's manual first. What scales can use it?Electrically it works in any scale. Its small size suits HO and larger; in N scale it fits wherever there is room in the shell or tender. How long will it keep my loco running?Expect roughly 6 to 20 seconds with headlights on for a typical HO locomotive, depending on motor efficiency and current draw.

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The SoundTraxx 851001 is the MC1Z102P6 DCC mobile decoder — a motor and lighting decoder without sound, for Z and N scale locomotives. It is rated 1 amp and connects by 6-pin nem651 plug. As an MC1 series decoder it operates on DCC only — it needs a command station and will not run on a plain DC power pack. Motor control is SoundTraxx Hyperdrive. Features DCC operation — requires a DCC command station 14 Hyperlight lighting effects across 2 function outputs — Mars Light, Pyle National Gyralite, single and dual strobes, Western-Cullen D312 rotary beacon, Prime Stratolite, Type I and II ditch lights with grade-crossing logic, dimmable headlight, Dyno-Light and FRED Rule 17 or directional lighting control, grade-crossing timers, adjustable flash rate and LED brightness correction Hyperdrive motor control for smooth low-speed running NMRA DCC compliant, made in Durango, Colorado More Information Item Number: SoundTraxx 851001 Model: MC1Z102P6 Type: Mobile decoder — motor and lighting, no sound Scale: Z and N scale Decoder Size: 13 x 9 x 3mm Connection: 6-pin NEM651 plug Max. Motor Stall Current: 1A Function Outputs: 2 (100mA each) Operating Modes: DCC only Max. Track Voltage: 22V Motor Control: Hyperdrive Shop the full SoundTraxx range, compare every DCC decoder we stock, or find install parts in DCC wiring. Want engine sound as well? Look at the sound decoders instead — this one is motor and lights only. FAQ Does this make engine sound?No. Mobile decoders drive the motor and lights only. For sound, choose a Tsunami2, Blunami or Econami sound decoder. Will it run on my DC power pack?No. This is an MC1 series decoder and is DCC only — it needs a command station. If you need DC too, choose an MC2 series decoder such as the 852002 or 852003. What does the model number mean?MC1Z102P6 breaks down as: MC1 series (DCC only), Z for Z and N scale, 1 amp, 02 function outputs, and the connector type. Will it fit my locomotive?It measures 13 x 9 x 3mm and connects by 6-pin nem651 plug. Check that against your locomotive before ordering — the other MC decoders use different connectors and sizes.

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The Digitrax DH127MT is a Series 7 HO mobile decoder built on the 21-pin MTC connector. If your locomotive has a 21MTC socket - common on European-built and many newer North American models - this drops straight in with no soldering and no harness to route. One amp continuous, two amps peak, with two FX7 function outputs at a generous 300mA. Building a DCC fleet? Browse our DCC Decoders, DCC Speakers, and DCC Accessories. Features 21-pin MTC socket (21MT) - plugs directly into any 21MTC-equipped HO locomotive, no soldering required. 1.0 amp continuous, 2.0 amps peak - comfortable for single-motor HO diesels and steam. 2 FX7 function outputs at 300mA, enough headroom for incandescent bulbs as well as LEDs, with effects like Mars light, ditch lights and beacons. Series 7 platform with back-EMF speed stabilisation for controlled slow-speed switching. Standard NMRA DCC - runs and programs on any DCC system, not just Digitrax. More Information Brand Digitrax Item Number DH127MT Product Type DCC Mobile Decoder Scale HO Motor Current 1.0 A continuous / 2.0 A peak Function Outputs 2 x FX7, 300 mA Connection 21-pin MTC (21MT) socket Series Digitrax Series 7 Sound No - motor and function decoder only Condition New FAQ How do I know if my locomotive takes a 21MTC decoder?Pull the shell and look for a 21-pin connector on the circuit board, arranged in two rows with one pin position blanked off as a key. If you see an 8-pin or 9-pin socket instead, you need a DH127P, DH127PS or DH127D. Which way round does it plug in?The blanked pin position keys the connector so it can only seat one way. Seat it square and do not force it - a bent pin is the usual cause of a decoder that will not respond. Does it have sound?No. This is a motor and function decoder. For sound in HO, look at a Digitrax SDXH series decoder or a SoundTraxx unit, plus a speaker. Do I need a Digitrax command station?No. It is a standard NMRA DCC decoder and works on any DCC system.

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The TCS A6 is a six-function HO-scale "drop-in" DCC mobile decoder with an integrated 1.5V power supply, designed to replace the factory light board in many popular Atlas, Athearn, and Kato diesels. Examples include the Athearn F59PHI and F3; Atlas RS-1, RS-3, RS-11, C424, and GP7; and the Kato GP35. Browse more DCC Decoders and DCC Accessories, or shop the full Train Control Systems lineup. Features Six-function HO drop-in mobile decoder — replaces the factory light board on supported Atlas, Athearn, and Kato diesels. Integrated 1.5V power supply for running 1.5V bulbs directly. Back-EMF load compensation for superior slow-speed control under load. Quiet Drive super-quiet motor control for buzz-free running. No-solder installation on supported drop-in locomotives. More Information Brand Train Control Systems (TCS) Item Number 1001 (A6) Type DCC Mobile Decoder (drop-in) Functions 6 1.5V Supply Yes (integrated) Fits Many Atlas / Athearn / Kato HO diesels Scale HO Scale Condition New FAQ Will it fit my locomotive?The A6X drops into many Atlas, Athearn, and Kato HO diesels (for example Athearn F59PHI/F3; Atlas RS-1/RS-3/RS-11/C424/GP7; Kato GP35). Check the TCS drop-in chart for your exact model. Does it include sound?No — the A6X is a motor and function (mobile) decoder, not a sound decoder. For sound, see the TCS WOW series. A6X or A4X?Choose the A6 for up to six functions or the integrated 1.5V bulb supply; the A4X covers four-function installs.

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A dummy plug is what keeps a converted N scale locomotive running on DC while you wait to fit a decoder. Plug a DNDP into the harness in place of the decoder and the motor circuit is completed for plain DC operation; pull it out, drop the decoder in, and the same locomotive is DCC. This is a five-pack, which is the sensible way to buy them - they are small, easy to lose, and you always need one at the wrong moment. Building a DCC fleet? Browse our DCC Decoders, DCC Wiring, and DCC Accessories. Features Run the same locomotive as DC or DCC - the dummy plug completes the circuit for DC, the decoder replaces it for DCC. Five per pack. These are tiny parts that disappear into the carpet; a spare or four is worth having. For use with the Digitrax DNWH and DNWHPS N scale harnesses. No soldering and no tools - it is a plug swap. Also useful when selling on or storing a locomotive you want to leave in DC condition. More Information Brand Digitrax Item Number DNDP Product Type DC Dummy Plug Scale N Quantity 5 pack Use With Digitrax DNWH and DNWHPS N scale harnesses Purpose Completes the motor circuit for DC operation Condition New FAQ What does a dummy plug actually do?It bridges the motor and pickup connections so the locomotive runs on plain DC. Without it, or without a decoder in its place, the circuit is open and the loco will not move. Do I need one if I am fitting a decoder?No. The decoder takes the dummy plug's place in the harness. Keep the plug somewhere safe though - you will want it if you ever pull the decoder out for another project or sell the loco as DC. Will these work in HO?These are the N scale version, for the DNWH and DNWHPS harnesses. HO installs use the corresponding HO parts. Why five?Because they are small, unlabelled and easy to lose, and because most people converting a fleet are doing several locomotives at once.

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The Digitrax SFX007 adds prototype sound to almost anything on your layout. It is a sound only decoder with no motor control, so it works as a second decoder alongside the mobile decoder already in your locomotive, or on its own in rolling stock, inside a structure, or under the layout for stationary sound. Eight factory sound projects ship stacked on the decoder and you pick between them with CV60, so it is ready to run straight out of the package. An 8 ohm box speaker and a 330uF capacitor are included, and the Digitrax Easy Connect harness needs only two wires to the track. Smart Power Management keeps the decoder from tripping your booster or programmer during setup. Specifications Brand Digitrax Item Number SFX007 Decoder Type Sound only, no motor control Sound System Digitrax SoundFX v3+ Sound Memory 16 Megabit onboard Audio Up to 8 simultaneous voices, customizable 16, 12 or 8 bit Speaker Included 8 Ohm box speaker, 16 x 26 x 9 mm, 6 pin plug Capacitor 330uF, included Track Connection Digitrax Easy Connect harness, 2 wires Addressing 2 digit and 4 digit Programming Direct and Operations mode Scale All scales Compliance DCC compatible, FCC Part 15 Class B UPC 652667200653 Features Sound only design pairs with the non sound decoder already in a locomotive, so you keep the motor control you have and add sound on top. Eight factory stacked sound projects: AC4400CW, ATSF 3751, C-420, GP7, GP38-2, SD40-2, SD70MAC and UP3985. Diesel and steam are both covered. CV60 selects which of the eight projects is active. No programming track gymnastics and no download needed to switch. Reloadable with any SoundFX 8 bit or 16 bit project using the Digitrax Sound Programmer and the SoundLoader app. Compact enough to sit alongside an existing decoder in many locomotives. Use custom sounds to give rolling stock a voice, or to drive stationary and under layout sound. Smart Power Management stops the booster and programmer shutdowns that plague high draw sound decoders. Speaker and capacitor are in the package, so there is nothing else to buy to hear it run. Frequently Asked Questions Does the SFX007 control the motor?No. It is sound only. Keep the mobile decoder already in the locomotive for motor and lighting control, and let the SFX007 handle sound as a second decoder on the same address. Can I use it as an add on to a Series 5 decoder like the old SFX006?No. Digitrax states the SFX007 is not compatible as a Series 5 add on the way the SFX006 was. It installs as an independent second decoder instead. What scale is it for?All scales. The decoder and the included box speaker are sized to fit HO and larger comfortably, and the harness wiring suits O, S and G installs just as well. Do I need to buy a speaker?No. The 8 ohm 16 x 26 x 9 mm box speaker is included and plugs into the 6 pin connector, along with a 330uF capacitor. Can I change the sound later?Yes. CV60 switches between the eight projects already on board, and you can overwrite the decoder with any SoundFX project using the Digitrax Sound Programmer and SoundLoader. Will it work in rolling stock or a building?Yes. Digitrax builds this decoder for exactly that. Load a custom project and use it for a caboose, a stock car, a sawmill, or any under layout sound scene. Explore More Browse the rest of the range at Squeaky's Trains & Things: Digitrax DCC Decoders DCC Speakers DCC Wiring DCC Control Systems DCC Accessories

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