DCC Accessories

If you've ever spent an evening crawling under your layout chasing a phantom LocoNet glitch, you already know how welcome the Digitrax LT1 is in a DCC toolbox. This compact tester checks LocoNet cables for proper wiring and lets you bench-test mobile decoders before they ever go near a locomotive, so problems get caught at the workbench instead of in the middle of an operating session. What's in the Box LT1 tester board with four diagnostic LEDs and a female 6-pin RJ12 jack Test harness with 6-conductor telco wire, male RJ12 plug, and a 100-ohm 2-watt protection resistor Printed instruction sheet covering both cable and decoder testing modes Why Hobbyists Reach for the LT1 Verify LocoNet cables in seconds. Plug a cable between the LT1 and any powered Digitrax command station or booster, and all four LEDs light up when the cable is good. Any dark LED tells you exactly which conductor failed. Test decoders before installation. Connect a mobile decoder to the harness, set it on your programming track or main, and use your throttle to confirm motor output, lighting functions, and DCC response without soldering it into a locomotive first. Catch shorts and bad crimps early. Especially useful if you build your own LocoNet cables with a crimper and bulk telco wire — one quick LED check confirms the crimp before the cable disappears under benchwork. Works with any scale. Z, N, HO, S, O, or G — if you run a Digitrax LocoNet system, the LT1 belongs in your toolbox. Specifications Brand Digitrax Item Number LT1 SKU 245-LT1 Type LocoNet Cable & Decoder Tester Connector RJ12 6-pin (telco) Indicators Four diagnostic LEDs Protection 100-ohm 2-watt resistor on harness Scale All scales (Z, N, HO, S, O, G) Compatibility All Digitrax LocoNet command stations, boosters, and starter sets Frequently Asked Questions Does the LT1 work with non-Digitrax DCC systems?The cable-test function works with any standard RJ12 6-pin telco-style cable, but the LocoNet test mode is specific to Digitrax LocoNet (NCE, MRC, and ESU systems use different bus wiring). For decoder testing, the LT1 works with any NMRA-compliant mobile decoder paired with a Digitrax throttle and command station. Do I need a separate power supply?No. The LT1 draws everything it needs from your Digitrax command station or booster through the LocoNet jack you plug it into. Can I test stationary decoders or accessory decoders with it?The LT1 is designed for mobile (locomotive) decoders. Stationary and accessory decoders use different wiring and are best tested with a dedicated programmer or in their intended layout circuit. What does it mean if only some LEDs light up?Each LED corresponds to a specific conductor in the LocoNet cable. A dark LED tells you which wire is broken, miscrimped, or shorted — usually pointing you straight at a bad RJ12 plug on one end of the cable. More from Squeaky's Trains Pair the LT1 with a full DCC accessories stash, browse our Digitrax collection for command stations, boosters, and throttles, or stock up on DCC decoders to bench-test with your new LT1.

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The Digitrax LT5C is a handy LocoNet diagnostic tool — it plugs into any LocoNet jack and uses an LED indicator to verify that the cable, the jack, and the LocoNet bus power are all wired correctly. The LED lights up only when ALL six pins of the RJ12 jack get correct signal — making it the fastest way to find a bad cable, a miswired UP5/UP6 panel, or a broken LocoNet run before you spend hours debugging your throttles. This 2-pack gives you one to leave at the start of your bus and one to walk around with. Looking for more DCC tools and accessories? Browse our DCC Decoders and Electronics & Wiring collections. Features 2 LT5C tester modules per pack — one for each end of the bus, or one for the home base and one to walk the layout. Plugs into any standard Digitrax LocoNet RJ12 (6P6C) jack. Single LED indicator lights when all six pins are wired correctly — instant pass/fail. No batteries, no setup — passive diagnostic, draws power from LocoNet. Compact key-fob sized housing, slips into any toolbox or pocket. More Information Brand Digitrax Item Number LT5C Type LocoNet cable / jack tester Quantity 2 testers per pack Connection RJ12 6P6C plug Indicator Single LED — on = pass / off = fail Power Drawn from LocoNet bus (no batteries) System Digitrax LocoNet Condition New — sealed FAQ What does it test?It verifies all six LocoNet pins are correctly wired AND that the LocoNet bus is delivering signal at that jack. If the LED is dark, you have either a bad cable, a miswired UP5/UP6 panel, an unplugged section, or a dead command station. Will the LT5C find a specific bad wire?Not exactly — it gives a pass/fail on the whole jack. To narrow down which pin is bad you'd plug it into successive jacks along the bus to find where the fault starts. For pin-by-pin testing, Digitrax also makes the LT1 (more detailed but discontinued in some regions). Do I need two?Two-pack lets you leave one at the command station to confirm the bus is alive, then walk the layout with the other to verify each UP panel and run as you set up or debug. Many builders also leave one permanently plugged into a hard-to-reach drop point for instant verification. Will it work on non-Digitrax DCC systems?No. LocoNet is Digitrax-specific. NCE, MRC, and other DCC systems use different cab buses.

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The Digitrax LNMC3 is a 3-pack of LocoNet modular couplers — small inline RJ12 (6P6C) joiners that connect two LocoNet cables together to extend a run or splice in additional length. Each coupler has a female RJ12 jack on both ends, so you can chain standard LocoNet cables (like the LNC82) into a longer drop without cutting or crimping anything. Looking for more DCC wiring and accessories? Browse our Electronics & Wiring and DCC Decoders collections. Features 3 modular couplers per pack — join LocoNet cables end-to-end without tools. Female RJ12 6-position 6-conductor (6P6C) jack on both ends — matches all Digitrax LocoNet cables. Maintains full 6-wire LocoNet signal through the connection. Compact inline housing — tucks neatly under benchwork. No batteries, no setup — passive pass-through connector. More Information Brand Digitrax Item Number LNMC3 Type LocoNet modular coupler / inline joiner Quantity 3 couplers per pack Connection RJ12 6P6C female — both ends System Digitrax LocoNet Condition New — sealed UPC 652667180078 FAQ What do I use these for?To join two LocoNet cables into one longer run — for example, connecting two 8-foot LNC82 cables to reach 16 feet, or splicing a short jumper into an existing drop. Plug a cable into each end of the coupler. Are these the same as a UP5 panel?No. A UP5/UP6 is a powered plug-in panel for throttles. The LNMC3 is just a passive female-female joiner to extend cable length — no throttle jack, no power, no faceplate. Will signal degrade through the coupler?For typical home-layout runs, no — LocoNet tolerates couplers fine. Avoid chaining many couplers on very long runs; if you need long distance, use a single long cable instead. Digitrax only?Yes — LocoNet is Digitrax's proprietary bus. The connector is standard RJ12 but the wiring/signal is LocoNet-specific.

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Block detection tells you a section is occupied. Transponding tells you which locomotive is standing in it. The Digitrax RX4 is the receiver that makes that possible: four transponding zones per board, reading the low-current pulses sent by transponder-equipped locomotives and cars, so the system knows not just that something is there but exactly what. More layout detection gear? Browse our DCC Accessories, DCC Wiring, and the full Digitrax range. Features Four transponding zones per RX4 - identify which locomotive or car is in each zone, not just that the zone is occupied. Low-current pulses that do not interfere with DCC decoders or other track signals. Works alongside your existing occupancy detection, adding identity to the detection you already have rather than replacing it. Compatible with most DCC systems, and adaptable to a range of layout wiring arrangements. The foundation for automatic routing, dispatcher displays and computer-driven operation that needs to know which train is where. More Information Brand Digitrax Item Number RX4 Product Type Block Transponding Receiver Scale All scales Zones 4 transponding zones per board Detection Type Transponding - identifies the equipment, not just occupancy Compatibility Most DCC systems Condition New FAQ What is the difference between detection and transponding?Occupancy detection reports that something is drawing current in a block. Transponding reports which decoder address is there. If you want a dispatcher panel or a computer to route trains by identity, you need transponding. Do my locomotives need anything special?Yes. Transponding only works with transponder-equipped equipment - either a decoder with transponding built in, or a separate transponder fitted to a car. Will the pulses upset my sound decoders?No. Transponding uses low-current pulses designed to sit alongside the DCC signal without interfering with decoders or other track signalling. Does it replace my block detectors?No, it complements them. Many layouts run both, using occupancy detection for the basic signal logic and transponding to identify what is in each block.

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The Digitrax SMBK is a three-pack of signal mast bases - the part that sits in the scenery, takes the plug from the signal driver cable and holds the signal head at the right height. Use them as bases under signals in any scale, or paint and detail them and they work as finished N scale signal masts in their own right. Signalling your layout? Browse our DCC Accessories, DCC Wiring, and the full Digitrax range. Features Three signal masts per pack, enough for a full turnout signal plant or three mainline positions. Works as a mast base in any scale - it carries the plug connection and sets the signal at the right height above the scenery. Doubles as a finished N scale mast once painted and detailed, so one part covers two jobs. Designed to mate with the 10-pin signal plugs used across the Digitrax signalling range. Pairs with the SMHK mounting hardware kit, which holds the plugs at the right distance under the layout. More Information Brand Digitrax Item Number SMBK Product Type Signal Mast Base Kit Scale All scales as a base, N scale as a finished mast Quantity 3 signal masts Connector For 10-pin Digitrax signal plugs Finish Unpainted - paint and detail as required Condition New FAQ What does a mast base actually do?It anchors the signal through the layout surface and carries the plug connection down to the signal driver cable underneath, so the signal itself stays removable. Can I use these in HO or O scale?Yes, as bases. At those scales the base sits below or behind the scenery and the visible mast is your signal head assembly. Only in N scale is the part itself convincing as the finished mast. What else do I need?A signal head or kit, cabling such as the SDCK, and the SMHK mounting hardware kit to hold the plugs at the correct depth under the benchwork. Do they come painted?No. They are supplied plain so you can paint and weather them to match your prototype.

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The Digitrax SMHK is the under-layout hardware that makes a signal install workable. Six metal straps and six spacers hold each signal plug at exactly the right distance below the benchwork, so when you push a signal down through the scenery it meets its socket squarely instead of you working blind with one arm under the layout. Signalling your layout? Browse our DCC Accessories, DCC Wiring, and the full Digitrax range. What's Included Item Qty Metal signal straps 6 Signal spacers 6 Features Holds signal plugs at the correct depth under the layout so signals plug in first time, every time. Six straps and six spacers - enough hardware for six signal positions. Metal straps hold their set position rather than drifting once the layout warms up or gets knocked. Designed around the 10-pin signal plugs used across the Digitrax signalling range. Pairs with the SMBK mast base kit and the SDCK signal driver cable kit to complete an install. More Information Brand Digitrax Item Number SMHK Product Type Signal Mounting Hardware Kit Scale All scales Contents 6 metal straps, 6 spacers Mounting Under-layout Use With Digitrax signal driver cables and mast bases Condition New FAQ Why do I need mounting hardware at all?Because plugging a signal in from above with your hand underneath the layout is miserable without it. The straps hold each plug rigid at a known depth so the signal seats cleanly when you push it down. How many signals does one kit cover?Six positions - six straps and six spacers. What else do I need for a signal install?Signal heads or a signal kit, mast bases such as the SMBK, cabling such as the SDCK, and a signal decoder to drive the aspects. Will it work with signals from other manufacturers?The hardware holds the plug, not the signal, so it works wherever you are using Digitrax-style 10-pin signal plugs regardless of whose head is on top.

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