Colin Rosenstiel wrote:
if one person could in practice have planted both bombs.

How easy would it be for someone to get on a carriage and
off at the next stop, leaving a bag, without looking suspicious?
I would have thought that they'd need to stay on a couple
of stops at least until the "his bag" information drops out
of enough of the other passengers short term memory.

If a bomber needs to stay on for four or five stops, to avoid
looking too suspiciuos, do these one/two bomber scenarios
still work?

#Paul