This Snap Relay is a very useful Track Arrangement Designed by Atlas Model Railroad. FEATURES: A double-pole, double-throw electrical switch actuated by a remotely controllable twin-coil, momentary power electromagnet. It can do all sorts of useful jobs on your layout, some of which are: -Power the frogs on Mark 2 Turnouts to eliminate the short "dead- spot" and prevent stalling of short-wheel-based locos. -Power trackside signal lamps to show switch point settings. -Feed control panel lamps to show points setting of remotely located turnouts. -Selective power control for dead-end sidings with all Atlas turnouts: Mark 2, Custom-Line, or Snap-Switches. Control X-sections automatically. It can be installed wherever convenient. Four rail joiners are provided. Detailed instructions with schematic display of snap-relay. INCLUDES: One Snap Relay REQUIRES: 16-18 Volt AC Operation Small Flathead Screwdriver kr8/8/01 ir/jl