1531R Controller - The 1531R Controller sends an infrared signal across your track. When a passing train reflects the signal, the controller activities any connected accessory. This authentic track side structure features die-cast metal construction and realistic details. The 1531R Controller is the perfect way to activate every track side accessory on your layout. The 1531R Controller has duration and sensitivity controls and is compatible with FasTrack and tubular track systems. - Lionel Item # 6-14111.