Digitrax DS52 Dual Stationary Decoder for Snap Switches or Slow Motion MachinesDigitrax DS52 Dual Stationary Decoder for Snap Switches or Slow Motion Machines NIB Dual Stationary Decoder for Bi polar, Snap Switches or Slow Motion Machines DS52 Features: Simple hook up and set up. Control 2 individual turnout machines. 2 Slow motion turnout machines, such as Tortoise by Circuitron or Switchmaster. OR 2 Solenoid type turnout machines such as three wire Peco or Atlas Snap Switches or two wire bi polar type turnout machines such as