As someone stated, a nice thread. A couple of thoughts:
1. I was told not to run switches off of track power, as it interferes with the DCS signal. You can usually get away with 3-4 switches, but 5 or more you should put them on their own power source. Now with the Rev. L TIU and software updates this might have changed.
2. If you are running 4 command loops and no non command trains, you don’t need 2 TIU’s. The 2 variable channels can be changed to fixed mode with a couple of key strokes on the remote or APP. You can save the extra TIU for a spare. The other big plus is if you using the APP, you only need 1 WI-FI unit as each TIU requires it’s own WI-FI interface.
If you are using Fastrack switches, simply remove the jumper on the back side and replace it with a 22uh choke on each switch. That will help prevent any degrading of the DCS signal. In addition, switching generally occurs only for a "nano-second" at a time.