ATCS Monitor for Windows
  Latest production version is 4.1.0, dated 11/28/2010 

ATCS Monitor allows you to graphically monitor train traffic on railroads that use the Association of American Railroad's Advanced Train Control System (ATCS) Specification 200 protocol, Wabtec (ex-Rockwell Collins) Advanced Railroad Electronics System (ARES) protocol, Union Switch and Signal Genisys protocol, and Safetran Supervisory Control System (SCS-128) protocol. To use this program to receive traffic over-the-air, you'll need a scanner with discriminator output, and a Windows PC (running 95, 98, ME, NT 4.0, 2000, XP, Vista, Win7, Win8, Win10) with a sound card.

ATCS Monitor Links
What is ATCS? A brief description of the Advanced Train Control System and terminology.
ATCS Monitor - Potential for misuse? - An open letter to the industry.
Screen Captures of ATCS Monitor running.
Frequently Asked Questions - Read these if you're having trouble operating the program.
Release History - See what's changed from release to release.
Frequencies - ATCS frequencies.
ATCS Address Structure - ATCS address decoding information.
Audio samples - Sample audio files for the various protocols.
ATCS Coverage - Where can ATCS be received?
Credits - People that helped make ATCS Monitor possible.
ATCS Monitor - Join today!
Files Area (Members Only!)
Visit the ATCS Monitor Wiki Project for tutorials and documentation

Please post comments, suggestions, and bug reports to the ATCS Monitor  Alternately, you may reach me directly at Before reporting a problem check out the Frequently Asked Questions page. Thanks.