I like learning the history of old towns and I often find books that have recounting of old happenings from historical societies. I have one such book about a town in Livermore Falls, Maine. I don't have it with me and it's probably not something you can order online. It's fairly interesting. Well, I think so.
It seems that at one time, back in the 1930s, they built a bank in town. The thing is, the bank was on one side of the railroad tracks and the cops were on the other side of the railroad tracks. Every day, a train would drive up to the Otis Paper Mill and be there long enough so that there were no roads available for the cops to get to the bank - for a couple of hours. You can probably see where this is going.
So, they robbed the bank. Sure enough, they got away with this a few times. Then the cops started putting an officer over at the bank when the train was due. Except they didn't really have a lot of police officers. So, somebody would slow the train down and the cop would have to leave, then the timing was right to rob the bank. Then, like a bad movie, someone stole the police car which, of course, made the cops follow them - except the train wasn't in place at the time and the only other cruiser was able to go to that side of the tracks and off they went to get their police car back.
Now, being clever Mainers, they proceeded to leave the car not very far on the other side of the river and the cops were able to find it and go back to the station but they now had to wait for the train to pass, only to find out that while they were getting their car back, someone had robbed the bank and crossed to the other side of it and gotten away over on that side.
Finally, things settled down and everything is going well and nobody had robbed the bank. So, the police go back to policing and, sure enough, somebody robs the bank because they no longer station an officer there. This happens sporadically until the 1950s when the bank finally moved to the other side of the tracks.
So, I guess the best time to rob a bank is when there's a train between you and the cop station.
If I understand it correctly, there's still *technically* a reward out for information leading to the conviction/apprehension of the thief or thieves. Rumors suggest that it was actually a number of people, not necessarily associated, who took turns robbing the Livermore Falls Bank.