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Rail Wayside Signal

Design Challenge

Replace (2) single-contact 10VAC lamps that provide redundancy for end of life.  Light must be seen up to 120-ft down the track in daylight.

Design Solution

Designed a primary LED lamp using a 250mA circuit to provide the required light level.  DDP designed the board and mounting to illuminate centered in the middle of the existing bulls-eye optic. A redundant, low power LED was designed into the circuit to illuminate in the case of failure of the primary source. Entire circuit was created to fail open not closed in the event that both LED’s fail simultaneously.