Tom-- Your switch on the left is from the early days of Gargraves. I first saw one in 1960 at Caboose Hobbies in mid-town Manhattan, a rather complete store for scale items. They recommended a relay called NJ 4PDT plus coil clearing contacts, or thereabouts-- a raft of contacts. The relay could move a wire which moved the points via a hole somewhere in the tie bar. This linkage was not supplied, but a drawing was, for both above and below table mounting. I believe the contacts were sufficient to assign 2DPDT to signaling and the other two to non-derailing and power routing. The coil clearing contacts may have been heavier and differently mounted.
Perhaps an internet search would turn up some details. Any current device that operates in a similar manner should be workable. Dave's suggestion sounds like a candidate. One thing to consider on this switch is whether the moving rails are contacted by the locomotive rollers and so have to be connected to one side or other of the circuit alternately, or simply isolated. Of course, Gargraves' switches now are different. --Frank (corrected relay to 4PDT, and added info next paragraph
NJ is a reference to Newark (Electronics?), located still in Newark, NJ. They catalog thousands of relays, but only one 4PDT (they are distributors). Curiously, this relay has also 4SPST( 3NO) contacts (in stock!). The coil is 24vdc, only one &a quarter watt, so it's not a drop-in for the old relay. The contacts are rated 8A (at 250v which suggests AC and a higher rating at lower voltage) using tin silver surfaces. The old one cost 3 hrs pay, so I have at most one or two; this one about twice which is much less of a bite these days. I could not see if it was set to apply a pull on an arm, but it might be interesting to fit the electrical needs of this early Gargrave's switch, in terms of energized rails. --FM