This is a Atlas Model Railroad 215 Selector.
The Atlas Selector enables the operation and control of two trains at the same time. Has four single-pole, double-throw (SPDT) switches to provide two-cab operation for four blocks. Selectors may be ganged together in any number to control additional blocks without inter-switch wiring. Can be used as area selectors for four-cab operation. Couples with No. 150-220 Controller if necessary. The housing has threaded screw hole terminals to accept 3-48 screws and Spade Tongue Solderless Connectors for wire hookup. Contacts are housed in a molded styrene housing with mounting holes for use on a control board. The Selector is part of the line of Atlas 150 electrical accessories and lighting.