Here's another project link. This is Ardian!'s AGHR Telemetry car for checking DCS signals around the track. AGHR DCS Telemetry Train Rev 7
This is probably not a beginner's project, and requires a bit of expense and a few parts so it's not exactly an inexpensive little PCB project. It also requires an Arduino and a Raspberry Pi (C code is included). It does really look like a very nice tool for diagnosing DCS problems as well as a pretty neat thing to have for a club or larger layouts. I think it would be fun to have on a smaller layout too (as in mine!).
