Here is a neat old item from a local estate. A man told me this was used to teach codes for Pennsylvania RR signal lights. Prewar with old cloth wires. I plugged it in and most of the bulbs work. Stands 23 and 1/2 inches tall by 11 and 1/2 wide by 6 deep. I looked a lot and could not find another like this. The cabinet latches and opens easy. Email any questions and thanks for looking.