Moq, thanks for the menschlach tone.
BTW, While Reb Moshe seems to hold that a handshake is more derech chiba than a train, one could even argue the opposite. In the NYC subways there are signs all over warning people not to touch people inappropriately on a crowded train. In other words, some people have actually felt like they were being abused, and have complained. I have never heard of anybody ever complain of any such overtones in a handshake.
But on the other hand, a couple walking while holding hands together is obviously a derech chiba. So it depends on the context.