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 inch radius track section, making the curved leg equal to an 18 inch radius section. To add a passing track and siding, simply replace a 9 inch straight section. When replacing an 18 inch radius curved section with an Atlas Snap-Switch, add a 1 inch straight section to the opposite side. All Atlas Code 100 has black ties and nickel silver rail.