Trains in England now have Quiet Carraiges, coaches in which it is not permitted to use a mobile phone or a personal stereo. Mostly these work fairly well, although you still get the occasional call broadcasting demi-conversations about being late, and gaggles of children are never silent.
Most of the time, I quite enjoy train journeys as they provide time for reading the Economist and a bit of personal reflection. Sometimes though I've nothing to really think about, and wouldn't mind having a conversation with one of my fellow travelers. Being the reserved sort that I am, these rarely spark up without some sort of, er, fuel (like delays, or merry inebriation). Anyhow, to provide a reason for a chat with a stranger it might be a nice idea to have a coach for extroverts which are in the mood for talking.
Then again, most people are fairly dull at the end of the day, so a conversation coach probably wouldn't catch on.