I already have tons of bench meters and power supplies, so what I really needed was a test track. I made mine.
It allows for testing 3-rail or 2-rail by switching the power at the left side. Each track section has a power switch and an indicator light. The offset allows me to test locomotives on the rollers with the wireless tether connected to the tender on the raised section of track. I also added a control track to test couplers and operating cars. This is also very portable, and I can remove it easily from the bench when it's not in use.
