Frozen signal at second stop, after two cycles, nudged in, got violated, but on next cycle, signal unfrozen for tram. But the very next signal flipped to stop from Thru with no white disk warning ... violated again. No one could have tested this simple routine: choose Sandbox choose custom choose line 2 take default start ( Engelbrunnen ) and end set time to 9 am ( avoid sun in driver eyes as no sunshade working ) start And from there, one bug after the other ... So simple. But AS DESIGNED, i.e. the learning, no EP Sandbox, the game does not work as advertised. This is not simulating a working tram line. Period.