The 4 rotary switches select which 1 of 3 cabs power each of the 4 divisions. There is a plug in for 2 of the cabs. A DPDT switch selects where the turntable gets its power from, either the N. P. Or the port division.
Editors note. The third cab will be a power pack, mostly used for testing and troubleshooting. The numbers and letters are from a peel and stick lettering sheet from Walmart. There are 2 smaller panels. Panel 1 is at Grants Pass and also has 2 plug ins and a DPDT switch to select power from either N.P. or the main division. Panel 2 controls O'Brien in a like manner.