Found something I cannot explain: I may do something wrong but cannot find out what it is.
In this case, a train from m1-b1 to m2-b1 does not trigger the enter and in events. I explicity checked the fbevents and can't find anyting strange. When I look at the tracing attached screenshot), it seems to me that the "eventmap" assumes that the loc can only come from block m3-b2 (and not from m1-b1). Might that be the reason why a loc coming from m3-b2 does trigger the enter and in events, but a train coming from m1-b1 does not ?