I ran across this video about the TMCC system and it seems to have some misinformation about how the TMCC signal propagates. I remember Dale went into this a long time ago, when Mike Reagan from Lionel explained it similarly. He sounds like he is describing how the DCS signal travels, not TMCC.
Also I'm not sure about his description of how 60 Mhz is counted. Sounds like he is counting half cycles.
Please let me know if I am missing something.