Terrance, I run Legacy, TMCC(ERR kit), and Proto2 engines on the same track. Even if you use all Proto2 (with the "ALL" command to start them up at the same speed) the engines may not run without the "faster" catching up to the "slower" consist. With my 40 plus Proto 2 engines all but 2 run within one smph of each other. I even have one loop that will run with 3 Proto 2 consists (1 MU, 1 double header) for more than 45 minutes without adjusting the slack between trains. My average over 17 foot loops is somewhere 10-15 minutes before I have to adjust the slack on any particular loop. As someone mentioned the 128 TMCC speed steps, those will permit you to adjust the TMCC consist with a bit of more grandularity than you have with DCS. Specifically this example with Legacy's 200 speed steps illustrates this point where my road engines (both diesels and steam) run between 37 and 40 speed steps to match my proto2 consists in front of them running at 10 smph. Switchers and subways have different ratios of comparision with Proto 2 smph with my Genset switcher running at speed step 24 to match my Proto2 Rdg 3 unit MU at 3 smph. You have a lot of speed steps to get a closest match to the proto2 speed. Note even with this there is not a "nuge" factor whereby you can tweek to consists to run at exactly the same speed and the slack between trains will eventually have to be adjusted.
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