What is a good solution for getting trustworthy simmers into servers? Some thoughts -
A "graduation" test, moving from small signal boxes up through the ranks, so as to be competent in the large boxes - This could involve a tutorial scenario, perhaps having a freight train run into a location, move the loco to depot, bring another onto the opposite end and depart "wrong line" to the next block. Or even a "grind" system, where you have to do a few hours in each box, working up to the largest panels.
A peer driven points system. Gain a good reputation from fellow players via an awards system...
As Sean said, weed out the asshats via moderation, using the already present reporting system.
Having said that, when the full release happens, are players going to mess around and not be invested, having had to pay for the sim? Maybe the idiots will diminish as the novelty (and free lols) wear off.