I've tried to make several different activities where somewhere in the game, you couple the player train into another engine and move to that cab to operate. Whenever I do, the activity runs for about a minute then ends with a "out of fuel" message.
It seems to me that I used to be able to do that, so maybe it's the Bin version. I'm using 1.7.0529.
While we're at it, is there a later "stable" version of Bin?