Black ties, nickel silver rail. 18" Radius Snap-Switches Designed for above or under-table switch machine Plastic Frog (cannot be powered) Cut-outs for rail joiners 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."