Hi,
I've recently been wanting to get into doing graffiti on freight trains, since that combines both my interest in trains with graffiti
I know the basics when it comes to well, painting on trains specifically, for example, don't paint on the loco, don't do it in a Network Rail depot (I'm in the UK just to be clear), don't paint over any identifying marks, don't get seen, etc, etc.

However, what I don't know as much about is the graffiti side of things, for example what paints work best, where's the best places to do it (ie I have some single track freight lines which are very unprotected near me but I have no idea if they're likely to stop on those, and if so for how long)

So: what tips do people have for this?

Also in case it matters the most likely thing I am to graffiti is a train with a class 66 loco, and carriages carrying limestone which is run by GBRf.

Also if this is in the wrong place, don't hesitate to let me know, I'll happily move it.