I haveto say, that this is also true in a place like London, where if your seen vandalising anything especially trains then someone will inform the police.
I lived in america for a few years, was working a lot, but decided i couldnt leave with out at least painting a few cleans. Managed to do a couple in nyc and also in chicago. At the time these were the hardest missions i'd done, but thren i moved to Europe.
First stop was Barcelona, it was crazy. No one gives a fuck if you tag in front of them. Family's walking tracks to get into stations without paying. But that was my mistake it looked easy. When it came to the commuter/ subway shit was different, and I ended up getting beaten by a security guard on the subway and fined.
Next stop was London, this was the opposite of crazy, lots of police on the streets and lots of visible and invisible security measures to guard their trains.
10ft high razor topped fences equipped with tremor sensors, security guards, motion sensors, infra red cctv and reecently pressure pads.
At first i thought it was impossible, but shit gets done, a lot. Stuff runs, but not for long, and this is only because so much gets done and the vandal squad and cleaners cant cope with protecting such a big system and they cant cope. Recently someone got sent down for 3 and a half years for tagging commuter trains in london...thats harsh.
Managed to paint a few tubes but they were all backjumps and to be honest werent that hard, and ran for a couple of hours, but the yards never had the balls knowledge to have a go.
But then also in europe yoiu have rome, meant to be quite hard with guards with guns and writers have been shot, but then on the other hand the subway doesnt get buffed, you just get taken out by locals.
Europe is a continent and every country is different, thats all i have to say.
peace