This is an interesting discussion, but I'm not clear on what role the Arduino is playing (at the risk of asking a stupid question...) - where does it "sit" in the operator - locomotive communications scheme? In an 'ordinary' TMCC scheme, the operator has a handheld controller, which communicates 'wirelessly' with the TMCC controller, which then communicates with the loco. Does the Arduino talk with TMCC controller or does it eliminate the TMCC controller by sitting in the loco/tender and talk directly to the TMCC board in the loco/tender? In the latter case, then presumably one can talk with the Arduino via bluetooth and a phone app?
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