Yesterday, we paused at Plymouth, New Hampshire to document a surviving example of a Union Switch & Signal lower quadrant semaphore on the former Boston & Maine’s Boston, Concord & Montreal route.

I’m sure there is a story about how this relic from the early years of automatic block signaling has survived in place on this rarely used former B&M route.

The signal is long out of service and likely a vestige of passenger services on this once important route. Signals of this type were typically used to protect following moves. In this configuration, the signal was was designed to display three aspects for two block protection in Automatic Block Territory.

Photos exposed using a Lumix LX7.

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