greg - Philadelphia & Reading / Reading
This one came up right below it, if you save the picture you cna zoom in enough to see the wiring diagram
http://www.ebay.com/itm/HO-AHM-RIVAROSSI-PLUG-A-MATIC-BLOCK-SIGNAL-W-WIRING-DIAGRAM-2585-2685-/121156494689?_trksid=p2054897.l4276
The three on the end go to a momentary controller like the AHM/Rivarossi turnout controllers, or a momentary pushbutton like an Atlas one, or similar. Looks like one rail gets insulated and one of the other two wires plugs in tot he main side, the other to the inslated section to cut power when the signal displays red/
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
If you belong to ebay, maybe you can send an e-mail to this person requesting a copy of some wiring instructions: http://www.ebay.com/itm/like/171258188389?lpid=82&item=171258188389&lgeo=1&vectorid=229466
Help requested?:I am trying to locate any and all information regarding the AHM Plug-a-matic Block Signal System.It looks like it was originally made by Rivarossi - all parts and boxes have this logo.Some of the product numbers include: 2585 / 2685The Plug-a-matic is discussed on the inside front cover of the 1967 Catalog.New for that year. Then it states details are in their Track Planning Book #2599Then the following years they offer the switch controllers...nothing about the Signal System(that is appearing on the pages copied to the HOSEEKER website) Does anybody have more information about the Block Signal System? orA copy of the Track Planning Book #2599?Any and all information is much appreciated.Schematics, instructions..Thanks for your input.Regards,Dochjmsemi-retiredModel Train Enthusiast !!!!!