Signal at Claremont Junction

Back in the 1950s and 1960s there was a signal facing southward at the point where the Claremont Branch met the B&M Connecticut Valley main line. It had a single light on top, then an arrangement of three lights, and then two lights at the bottom. Does anyone have any information about this signal?

Thanks!
-John

Just guessing, but it could have been a US&S vertical color light installation for the interlocking. Vertical color lights have a simpler mechanism -- just relays for the lamps -- than searchlights, which have relays and actuators to move the color filters. Since Claremont probably wouldn't have been a high-speed run-through, the top light would show only red, the middle any of the three, and the bottom only red or yellow to provide a Medium Clear or more restrictive indication as needed.