Modular Products Price List


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These pages contain the price list and product descriptions for model railroad electronics control modules from TracTronics Incorporated. This page contains descriptions, pricing, and ordering information for our switch & signal control and throttle products for all scales. We have now added pointers in the product descriptions to on-line copies of the Mainline Modeler magazine articles which describe the operation and use of each product.

Information on our constant lighting products for LGB G scale passenger cars and cabooses is contained on this page. Please Note these products have been discontinued.

Information on our computer automation products is contained on this page.

You can order products directly from TracTronics by sending us a check made payable to Marc Haas for the total list price of products ordered, together with $10 shipping and handling in the US. You must also include 8.25% sales tax if ordering for shipment within Texas. For shipment outside the US, call, write or email us for details.

Marc Haas
4128 Brookway Drive
Fort Worth, TX 76123
817-798-3162
email: marc@tractronics.com


Quick Index to Our Products


SwitchWitch Control Circuit for Twin-Coil Switch Machines

SwitchWitch is a capacitive discharge unit and driver circuits for one twin-coil switch machine, contained on one 2" by 2" printed circuit board. SwitchWitch-equipped switch machines always get the same drive energy no matter how many switch machines are fired at once, as each switch machine has its own capacitive discharge unit. SwitchWitch is ideal for reliably driving multiple switch machines from diode matrix routing circuits, such as in yard ladders, engine terminals, and industrial areas.

Each SwitchWitch uses only 20 mA while recharging, and only 7 mA are required to actuate the unit. These low currents preserve pushbutton contacts and allow telephone hook-up wire and a small power supply, or even batteries, to be used to drive the circuit. Complete instructions include easy-to-follow wiring diagrams for use of the circuit and for constructing a power supply from Radio Shack parts.

No. 1 -- One Complete SwitchWitch Kit....................$8.95
No. 2 -- One Assembled SwitchWitch
for Actuation by Grounding the Inputs.....................$17.95
No. 3 -- One Assembled SwitchWitch
for Actuation by Driving the Inputs..........................$17.95


SwitchLock Control Module for Motors, LEDs, Locks, Relays

The SwitchLock module provides momentary pushbutton control of devices requiring steady drive voltages. SwitchLock contains four separate circuits, each capable of controlling stall motor switch machines, LEDs, and relays, or of providing a prototype electric lock switch function, contained on one 2 1/2" by 2 1/2" printed circuit board. The four circuits can each be used independently for any of these purposes. Each circuit contains a latch to remember the desired output, and both bipolar and TTL driver circuits.

SwitchLock allows stall motor switch machines to be controlled from multiple locations using momentary pushbuttons or diode matrix circuits. The unit comes complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams for using the circuit and for constructing a power supply from Radio Shack parts.

No. 4 -- One Complete SwitchLock Kit....................$18.95
No. 5 -- One Assembled SwitchLock........................$28.95


SwitchMap Diode Matrix Control Circuit

The SwitchMap diode matrix control circuit provides a 10 row by 18 column diode matrix circuit on a printed circuit card measuring 2 3/4" by 4 1/2". All 180 diode positions are provided on the board, allowing an arbitrary diode matrix to be constructed. The diode matrix is used to provide switch routing functions in yard ladders, engine terminals, and industrial areas. The 10 by 18 matrix is sufficient to provide the routing for a ten-track yard ladder.

The unique design of SwitchMap allows multiple small matrices to be constructed on one board, and also allows multiple SwitchMaps to be combined to accomodate a very large matrix. SwitchMap interfaces to SwitchWitch and SwitchLock to provide diode matrix routing for both twin-coil and stall motor switch machines from the same matrix, and interfaces to BlockLock to provide prototype operation of interlocking signal plants.

SwitchMap comes complete with connectors and mounting hardware. Complete instructions include a discussion of diode matrix routing, instructions for designing and assembling the user's diode matrix, forms for documenting the user's diode matrix, and examples of diode matrix designs for specific applications. The diodes required to build the matrix are commonly available, and are also available from TracTronics as No. 6A. Additional connectors for assembling multiple diode matrices on one SwitchMap board are available from TracTronics as No. 6B.

No. 6 -- One SwitchMap Diode Matrix Board.........$21.25 Back In Stock!!!
No. 6A -- One Hundred SwitchMap Diodes...............$7.95
No. 6B -- One Extra Set SwitchMap Connectors.......$3.95


BlockLock CTC Panel Block Signal Control Circuit

The BlockLock CTC panel block signal control circuit provides control of two-color block signals for one controlled block from prototype CTC panel controls. The BlockLock circuit provides all of the logic required to interconnect the CTC panel controls and indicators, the block signals, and the train detectors in a single printed circuit board measuring 2" by 2 1/2".

The BlockLock circuit latches green signal indications coded into the panel by the dispatcher, until the indication is knocked down by a train detector signal. Opposing green indications cannot be coded, nor can a green indication be coded into an occupied block. BlockLock can also be wired to implement interlocking signal plants for grade level mainline crossings and branches.

BlockLock comes complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams, a sample CTC panel layout for one block, and an explanation of how to wire the units for interlocking plant signals.

No. 7 -- One Complete BlockLock Kit......................$14.95
No. 8 -- One Assembled BlockLock..........................$24.95


DetectTrain Current Sensing Train Detector Circuit

The DetectTrain current sensing train detector circuit detects trains by sensing the current draw of locomotives, lighted cars, and cars equipped with axle resistors which are in the isolated section of track connected to the detector. The DetectTrain circuit detects trains and provides an occupancy signal for lighting LED indicators and driving other electronics in a single printed circuit board measuring 1 1/2" by 2 1/2".

The DetectTrain circuit interfaces to most signal and control electronics, including AutoBlock, AutoSearch, BlockLock, MasterFlasher, and WhichWay for signaling, SwitchLock and SwitchWitch for switches, and SECSI for computer automation. It is compatible with both command control and cab control systems using common-rail wiring.

DetectTrain comes complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams for using the circuit and for constructing a power supply from Radio Shack parts.

No. 9 -- One Complete DetectTrain Kit....................$14.95
No. 10 -- One Assembled DetectTrain......................$24.95
No. 9A -- Thirty DetectTrain Diodes...........................$5.95


MasterFlasher Programmable-Rate Multi-Output Flasher Circuit

The MasterFlasher programmable-rate multi-output flasher circuit provides four high current flasher outputs which can each be programmed for flash rates from thirty times per second to once every four seconds. The four MasterFlasher outputs include two grounding outputs and two driving outputs for versatility. The outputs can be programmed to flash alternately, and can be wired to provide duty cycles of 25%, 50%, and 75%.

The high voltage, high current outputs of the circuit allow MasterFlasher to be used to flash bulbs, buzzers, and other higher voltage, higher current devices than LEDs, and to flash many devices on a single output. The MasterFlasher circuit interfaces to DetectTrain to provide automatic flashing cross buck and crossing gate lights, with only one MasterFlasher circuit required to drive all of the crossing gate lights on a large railroad.

MasterFlasher comes complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams for using the circuit and for constructing a power supply from Radio Shack parts.

No. 11 -- One Complete MasterFlasher Kit..............$24.95
No. 12 -- One Assembled MasterFlasher..................$36.95


AutoBlock and AutoSearch Signal Logic and Driver Circuits

The AutoBlock and AutoSearch signal logic and driver circuits each accept multiple Stop and Approach inputs from switches, relays, and other electronics, determine the required signal aspect, and drive the signal head to display the required signal aspect. AutoBlock is used for color light and position light signal heads, and AutoSearch is used for searchlight signal heads. Together with DetectTrain, AutoBlock and AutoSearch can be used to implement an Automatic Block Signaling (ABS) system.

AutoBlock and AutoSearch come complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams for using the circuitc and for constructing a power supply from Radio Shack parts.

No. 13 -- One Complete AutoBlock Kit.....................$14.95
No. 14 -- One Assembled AutoBlock.........................$24.95
No. 15 -- One Complete AutoSearch Kit...................$14.95
No. 16 -- One Assembled AutoSearch.......................$24.95


WhichWay Direction Precedence Signal Logic Circuit

The WhichWay direction precedence signal logic circuit connects to track detectors such as DetectTrain to determine and remember the direction of traffic within a track segment. Together with DetectTrain, AutoBlock and AutoSearch, WhichWay can be used to implement an Absolute-Permissive Block (APB) signaling system. Adding BlockLock CTC panel block signal control circuits provides full-function Centralized Train Control (CTC) operation with intermediate ABS signals, fleet mode, and complete CTC panel controls and indicators.

WhichWay comes complete with connectors and mounting hardware. Complete instructions include easy-to-follow wiring diagrams for using the circuit and for constructing a power supply from Radio Shack parts.

No. 17 -- One Complete WhichWay Kit....................$16.95
No. 18 -- One Assembled WhichWay........................$26.95


CoolerCrawler High-Performance Throttle Base Unit

The CoolerCrawler high performance throttle base unit is intended for the model railroader who wants the finest throttle available for DC block control wiring. The unit features excellent slow speed control of all motors, without using the pulse width modulation techniques which cause motor heating and can permanently damage some motors.

The rounded waveform of the CoolerCrawler results in safe cool operation even when prototypical switching speeds are maintained for hours. We have run long heavy trains at very slow speeds continuously for six hours and the locomotive motor remained cold to the touch. The excellent slow speed control upgrades the performance of all locomotives on the layout without remotoring and regearing. The performance of moderately-priced stock commercial locomotives when powered by the CoolerCrawler unit is outstanding.

The CoolerCrawler base unit includes memory and momentum features which allow walkaround control with plug-in hand units. The memory has been designed to decay slowly over several minutes to bring unattended trains to a very slow stop. The unit also has a reverse-blocking feature which prevents reversing of the output when the throttle voltage is above an adjustable set point, to prevent the accidental reversing of moving trains.

The CoolerCrawler base unit is capable of a six amp output. The unit has a current limiting feature which limits output current to the six amp rated value even into a dead short. A simple component substitution can set this current limit to a lower value if desired.

The CoolerCrawler base unit does not include a throttle hand unit. The layout and control feel of throttle hand units is such a personal matter that it is impossible to provide a hand unit which meets individual desires. Instructions are included which describe how to build either a push-button or a throttle knob tethered hand unit from Radio Shack parts. The hand unit will cost from $10 to $20 in parts, depending on the kinds of buttons and knobs you use.

An additional option for the throttle hand unit is a radio control hand unit. The CoolerCrawler base unit includes circuitry to interface directly to an available commercial radio control system. The system receiver connects directly to the CoolerCrawler base unit without additional circuitry, power supplies, or batteries. The system transmitter is about the size of an audio cassette box, with no external antenna, and runs on a 9 volt transistor battery. We strongly recommend radio control hand units for walkaround layouts. The radio control system cost is approximately $120, and should be balanced against purchasing and wiring hand unit plug-in locations around the layout and the inconvenience of tethered operation. ***As of December 2011, the radio control units are unavailable. If we find suitable replacements, we will post here.***

The CoolerCrawler base unit has six outputs: two for track, two for reverse loops and voltmeters, and two for an ammeter. The unit has fourteen inputs: two for each of two transformers, four for tethered hand units, and six for a radio control receiver. The unit does not include transformers. One Radio Shack transformer 273-1522 provides a 3 amp output, and an additional 273-1522 boosts the CoolerCrawler capacity to 6 amps.

The CoolerCrawler base unit is the finest throttle we know how to make. The performance, the features, and the quality of the parts used make this the no-compromise throttle solution.

No. 19 -- One Complete CoolerCrawler Kit.............$89.95
No. 20 -- One Assembled CoolerCrawler...............$129.95

For assembled unit, specify transformer voltage 12.6 VAC or 18 VAC, and current limiting 3 Amps, 4 Amps, 5 Amps, or 6 Amps. Call for details.

DetectDCC Current Sensing Train Detector Circuit for DCC

The DetectDCC current sensing train detector circuit for DCC detects trains by sensing the current draw of locomotives, lighted cars, and cars equipped with axle resistors which are in the isolated section of track connected to the detector. The DetectDCC circuit detects trains and provides an occupancy signal for lighting LED indicators and driving other electronics in a single printed circuit board measuring 3/4" by 1 1/2".

The DetectDCC circuit interfaces to most signal and control electronics, including AutoBlock, AutoSearch, BlockLock, MasterFlasher, and WhichWay for signaling, SwitchLock and SwitchWitch for switches, and SECSI for computer automation. DetectDCC uses an inductive pickup which keeps the DCC electronics and the detection and signaling electronics completely electronically isolated. It is designed strictly for DCC, and does not require common-rail wiring.

Complete instructions include easy-to-follow wiring diagrams for using the circuit and for constructing a power supply from Radio Shack parts.

No. 21 -- One Assembled DetectDCC......................$15.95


TracTronics is a new concept in electronic model railroad control.

TracTronics is oriented to the model railroad operator. TracTronics modules do not require connecting a personal computer into the railroad, and they do not require an extensive knowledge of electronics on the part of the user. TracTronics modules enhance the reliability and prototype operation of model railroad systems by providing modular solutions to specific problems that have avoided simple solutions in the past. TracTronics modules can be used independently or combined to form a complete solution to model railroad control.

TracTronics modules are not epoxy-potted black boxes which force your operations to fit the circuit. TracTronics modules include circuit diagrams and complete technical explanations so you understand how to use the circuits and fit them into your operations. Most TracTronics modules come with connectors which allow easy substitution of spares during an operating session so your electronics never leaves you stranded. And all ICs on TracTronics modules are socketed, permitting easy replacement of any failed IC.


Ordering Information

To order TracTronics products, send us a list of the products desired, along with your personal check made payable to Marc Haas for the total list price plus $10 US shipping and handling within the United States. For shipment to points within the state of Texas, you must also include 8.25% Texas sales tax.

For Canada shipments, shipping and handling charges are either $13 US or $17 US, depending on your postal code. Call us and we will advise. Please make payment in US funds. For assembled units shipped to Canada, you must pay the GST to the shipper when the products arrive; there is no GST on electronics kits. We will handle the customs and export paperwork at this end.

International shipments go by US Post Office. If you are ordering from overseas, we will need to iron out the details for your country and advise you as to shipping and handling charges, which may add some time.


TracTronics is a Registered Trademark of TracTronics Incorporated.
SwitchWitch, SwitchLock, SwitchMap, BlockLock, DetectTrain, MasterFlasher, AutoBlock, AutoSearch, WhichWay, CoolerCrawler, and DetectDCC are Trademarks of TracTronics Incorporated.
Copyright 1992 - 2012 by TracTronics, Incorporated.
Last updated: December 28, 2012
These pages maintained by: Marc Haas
Please send all comments/problems to: marc@tractronics.com