A-Train Systems

Model Railroad Electronics and Control


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User Guides, schematics, and other documents relating to A-Track and the various projects described elsewhere are available for download as Portable Document Format (PDF) files. If you do not have a copy already installed, a PDF document reader to view these files is available free from Adobe by clicking on the link below -

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A-Track for Windows

Important : If you are using Norton security programs on your computer, you may find that files downloaded from this page are erroneously flagged as a threat, or even quarantined, possibly with the threat classified as "WS.Reputation1". This does NOT mean that the files are infected with any form of virus or other malicious software, but simply that the files are new to the Internet, and have not been downloaded by many people so far. Previously you could verify this on the Symantec website at http://www.symantec.com/security_response/writeup.jsp?docid=2010-051308-1854-99, but this article has been removed following Symantec's takeover by Broadcom. There is a similar explanation on the Norton website at https://community.norton.com/en/forums/clarification-wsreputation1-detection or you can use Google or another search engine to check on the meaning of "WS.Reputation1".

Unfortunately, as a very small software developer, A-Train Systems has no influence with Symantec to change this behaviour, but can only assure you that no files here contain malware nor pose any kind of danger to your computer. This also applies with some other Internet security suites and types of browser, which may display warnings when you try to download the A-Track Setup executable file, in particular, or even block the transfer. In case of continued difficulty, please use the Contact form to request further assistance.

All of the A-Track documentation has been completely updated to cover the new program features incorporated in Version 4.4.3. Since the updated Reference Manual now stretches to over 500 pages, you may wish to start with the much shorter User Guide which, after a summary of the main features, covers program installation together with a brief description of all functions accessible from the main menus. Note that the full text of all sections of the Reference Manual are available from within A-Track as context-sensitive Help pages. Pressing the F1 key at any time when running A-Track will open a Help page directly relevant to whichever program function you are currently using.

Following re-hosting to a new server in February 2021, and a change in how file security is handled, the Check for Updates facility in previous versions of A-Track will no longer work.

All users are, therefore, recommended to update to the latest version - Release 4.4.325 - which can be obtained via the links below.

PDF File

Installation Notes - A-Track Release 4.4.3

862 KB

PDF File

A-Track User Guide - Release 4.4.3

1 970 KB

PDF File

A-Track Reference Manual - Release 4.4.3

25 717 KB

PDF File

Installing USB-to-Serial Adapter Drivers

1 144 KB

A-Track EXE File

A-Track Release 4.4.325 - Setup File

42 656 KB

ZIP File

A-Track Release 4.4.325 - Full Installation Package

146 880 KB

Click to download any available previous versions


If an earlier version of A-Track is already installed on your computer, you should uninstall it before starting installation of the new version below (this is done most easily from Start Menu / All Programs / A-Track/ Uninstall or, in Windows 8 or 10, right-click on the A-Track tile on the Start Screen, then select Uninstall).


As an alternative to downloading the A-Track Full Installation Package, an installation CD is available for purchase at a cost of $15 (approx £12), inclusive of shipping worldwide. Payment can be made safely and securely via PayPal, using any credit or debit card, even if you do not have a PayPal account. Click on the button below to proceed - please remember to provide your full postal address (if you have a PayPal account your address will be supplied automatically) together with any particular shipping instructions -



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PDF File

Quad Servo DCC Decoder - Part 1 - Construction

2 257 KB

PDF File

Quad Servo DCC Decoder - Part 2 - Setup

556 KB

PDF File

Quad Servo DCC Decoder - Update - Improvements

663 KB

PDF File

Quad Servo DCC Decoder - All Updates

683 KB

PDF File

Quad Servo DCC Decoder - Code - Ver 5.3

118 KB

Arduino Sketch

Quad Servo DCC Decoder - Sketch - Ver 5.3

47 KB

Courtesy of José Antonio Salazar, a Spanish translation of the documentation is available here.

Cortesía de José Antonio Salazar, una traducción al español de la documentación está disponible aquí.

PDF File

Quad Servo DCC Decodificador Parte 1 - Construcción

2 889 KB

PDF File

Quad Servo DCC Decodificador Parte 2 - Configuración

2 292 KB

PDF File

Quad Servo DCC Decodificador Actualización - Mejoras

3 251 KB

The software (Arduino sketch) for the Quad Servo DCC Decoder can be viewed by simply clicking on the links above. Alternatively, download the sketch ready for input to the Arduino IDE (.ino format) or as a PDF document. Download the files by right-clicking on the links and selecting the appropriate option offered by your browser to 'Save' the files (or links).

PDF File

DCC Block Occupancy Detector (1)

207 KB

PDF File

DCC Block Occupancy Detector (2)

182 KB

PDF File

Automatic Railroad Crossing Controller - User Guide 1.1

428 KB

PDF File

Automatic Railroad Crossing Controller - Parts & Schematics 2.4

2 436 KB

PDF File

DCC Decoder Tester - Version 2

1 145 KB

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A-Track - Original Atari Version


PDF File

A-TRACK User Guide - Release 2.2

335 KB

PDF File

A-STILE User Guide - Release 2.0

600 KB

PDF File

A-TRACK Release 2.2 - Screenshots

175 KB

PDF File

A-TRACK - User and Interface Hardware - Pictures

423 KB

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Copyright © JT Chamberlain 2004-2021  All rights reserved
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Page Last Updated 17 March 2022