Someones up to no good

Here is a perfectly working 1920's switch, the box said so. It said "switch". No kidding, it was a big switch. For what I am not sure. It was one of those switches that looks like if you pull it down the power for the whole city would go out. A serious switch.
I wonder what it does...

Someone willing to find out!
There was also a STOP THE TRAIN pulley. It was a simple wire the guard told us it applied the brakes and bought the whole train to a screeching halt.... tempting, the fine was only $10 ( back in the 20's Im sure inflation wouldnt affect that too much!