This is an Atlas HO-Scale Code 100 Remote Righthand Snap-Switch N/S Track. Precisely engineered with black injection molded plastic and featuring black ties and nickel silver rail, Code 100 is extremely popular and considered an industry standard.
These switches have a remote control switch machine attached so you can wire the switch to be "thrown" (changing the direction of the rail), from your control panel, rather than from the switch itself. Comes with a 1/3 18" radius section, making the curved leg equal to an 18" radius section. To add a passing track and siding, simply replace a 9" straight section. When replacing an 18' radius curved section with an Atlas Snap-Switch, add a 1-1/2" straight section to the opposite side."