I acquired an older Williams GG1, #4053.  It only runs in forward.  I opened it up and found what appears to be a kludge, which I'd like to unwind.  The control board has a three position dip switch hanging out in space and wired to some spots on the board.  The only position that lets the train run at all is the combination it's currently in.  A couple of them appear to reverse one mother and have them fighting each other.

The board is labeled Williams Productions Reverser and has no part number.  It's a single sided board with a couple of relays and a couple of socketed chips, a Motorola MC14017B and a CD4011B.  Obviously, there are some other components, transistors, a heat-sinked TO220, etc.

I'd like to find any data available on this control board and how to get this train running in both directions.