Do you have any information, including a wiring diagram, that can help me wire my Lionel No. 450 Operating Signal Bridge using AC relays? Thanks! — Fred Richmond As Lionel operators certainly ...

The diagrams and photos show how to wire up the fuel pump and oil-pressure switch to a commonly available, industry standard, ISO-type "1 Form C single pole/double throw" (SPDT) relay.

Circuit diagrams use symbols to represent these, enabling engineers worldwide to communicate & understand circuit designs effectively. BBC Homepage. ... bulbs, buzzers, and motors, ... (SPDT) switch; ...