@Yank2304 posted:The sets with PS 2 - 5 volt boards are the R21 redbird, R17 diamond 5 train, R32 N train and the R17 all red scheme. I agree - stay away unless you get a dynamite price because they are prone to fail in the blink of an eye - you don’t have to do anything wrong and the board blows.
The first proto 2 - 3 volt system was the R17 graffiti set.
Good luck!
You left out the original R36 worlds fair set. That is the only ps2 5 volt subway engine that is still chugging in my fleet. All others blew years ago and were replaced with ps2 3 volt boards or ps3 stacker boards. Hopefully, this engine can avoid the curse. I got hopeful when I read your post and thought maybe I had pegged the worlds fair engine wrong and didn’t have to worry about it blowing aboard. Alas, a quick check of the underside just now confirmed it’s a ps2 5 volt engine, the last survivor in my entire subway collection.