I'm sure this is common, you're out of trains, and waiting for another to enter a station so it becomes available.
So what do you do? You click on the station you want to launch about 30 times per second.
Trouble is, in TVO - The icon for the train comes up and one of the "extra" clicks stops the train.
A possible solution would be to delay the new train's menu until the new train sound completes -that'd give users an audible clue that the train launched, and also about a second or so to realize they don't have to click anymore.