LGB
Automatic Shuttle Circuit

Walthers Part # 426-10340, p. 75 Walthers 2003 Big Trains Reference
G scale, $249.98, currently in stock at Walthers

 
This automatic reversing module is ideal for an automated display layout or test track. Operates in Basic mode with adjustable acceleration or Prototypical mode with adjustable acceleration and braking. Stopping times at each "station" are adjustable, and the unit also features built-in short circuit and overload protection. Requires 10-24V DC.