They are only strict about uniform. The book says be neat and trimmed. And presentable but I doubt they'll pull you aside for an unshaven beard. So it's more about dres code. Different titles have different clothing. Like a conductor has to wear a conductor hat and tie. But the operator can wear a cap and no tie. What's wierd is that you only have to wear the tie around a certain time of year. Basically they dont require you to wear the tie around the summer time as a c/r. They say you have to wear what they provide including the boots. However, many people wear Dickie pants instead the pants they provide. And if you want to wear boots other than what they give you, youd have to get them approved. As far as tatoos and other things, as long as it's not gang affiliated, I dont think they care. It's all in the rule book.