ATLAS O 21ST CENTURY SIGNAL SYSTEM - FOUR PACK (2 RAIL)

*Many of the PRR type position lights signals are still in service on today s rail lines. Quite a few have been updated to a full color aspect signaling. In the position light format, green is vertical, yellow is diagonal, and red is horizontal. The center light is usually removed and a blank cover put in its place. Now, Atlas O realistically recreates this signal in miniature. Using the acclaimed 21st Century Signal System electronics, prototypical signaling is a reality for your layout. Fully compatible with all Atlas O signal products.