Hmm... The whole point of this is mostly for large layouts, that's the only place that the TMCC Buffer makes sense.
I haven't researched this, but if you have multiple TIU's, don't all the commands go out on all channels? The TIU doesn't know which segment that the locomotive is, and it could have transitioned to a different place. I suppose there's enough time for the signal to have skew based on each TIU has to process the incoming remote command individually.
I did have another thought.
The TMCC buffer increases the signal amplitude in an effort to combat the increased capacitance of a large layout. The output buffer is capable of driving about a .1uf capacitance of the outside track to earth ground. One of the issues is the amplitude, the buffer has a 3:1 gain. I wonder if dropping the gain to unity and adding a larger isolation capacitor would allow it to drive the same capacitance but have less effect on the DCS signal? This TMCC Buffer Schematic.pdf is what we have now.
