I just realized this after getting my mini air compressor withouth moisture control. Condensation builds up inside the tank(i have a 4L tank) and eventuallually its going to be full of water. I've seen on various trains water dripping from carriges or locomotive itself when they come into the station or leave the station. Would be great to simulate this in TSW. Taking into account the type of locomotive, weather and humidity, not forgetting about the carriges. I think they all would have an air tank there that would need to be drained, it was all I think automated in one way or another, something popped out when the tank was full of water, im no expert tho. Either way, drain the AIR TANKS
A problem experinced by truck drivers for example is, driver complains the air dont last, it empties too quick. That would be pretty bad if it was locomotive or carrige.