You’ve no idea if criminals are smart or stupid as a cohort because you only know about the ones that get caught. That’s a type of survivorship bias (or a reverse survivorship bias depending on how you think about the problem!). There are, of course, many, many criminals who don’t get caught that you don’t know about and whose intellect you aren’t able to assess.That's a new one on me. Care to explain ?
There are far more clever ways to defraud or steal from train companies than the ones we hear about on this forum.