Easter eggs in transport

The fact that in different programs you can see something interesting, unexpected, if you press something, then go, and then select - everyone knows. But there are such features in public transport.
For example. If controllers are working in the train, as a rule, they start a detour from a certain car. Their route is quite predictable. Try to figure out in which car they will end up at your station (this can also be established by experiment). So, when the train comes, you need to go to this car, of course, with a ticket, it will be useful to you.

Remember the crowds of people running from control through the entire train? It is logical that the least people will be in the car where there is control. So, there are free places. Show a ticket, sit down and drive - that's all. Hares go standing.
Big request - share more such observations, if anyone has. This experience seems to me quite interesting.