Check the listing for details. Atlas 205 Connector, a classic model railroad electrical accessory. Color: Black, Condition: Used. Listed at 8.00 USD. Atlas 205 Connector, which is a device used in model railroading to control electric power to track sections or accessories. Key features and description: Functionality: It is designed to turn electric power on or off to track sections (blocks) or various accessories. Switches: The connector unit contains three single-pole, single-throw (SPST) on-off switches in one convenient package. Usage: An important application is to control power to sidings or provide individual power control to several yard tracks or lighting accessories. Connectivity: Multiple connector units can be coupled together easily without additional wiring. The housing includes mounting holes and terminals to accept spade tongue solderless connectors.