Circuitron A 5501 BD-1 Optical Detector - With 4 Opto-Sensors March 21_24_DON B its great for adding a

its great for adding a FRED at the end of the train

direction indicators imprinted orange

Length over the buffers approximately 210 mm / 8-1/4"

set ready to ride on their custom choppers

last but not least

Circuitron A 5501 BD-1 Optical Detector - With 4 Opto-Sensors March 21_24_DON B its great for adding aTiny Opto Sensors detect train movement. Sensors mount between the rails and activate circuitry when shaded from a passing train. Independent of track power, rolling stock requires no modifications. Sensors fit between ties and may be ballasted over in most cases. Circuitry is extremely sensitive and will operate properly under very low levels of room light. Positive indication whenever a section of a layout is occupied by rolling stock. Contains all