Signal System

Discussion relating to commuter rail, light rail, and subway operations of the MBTA.

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Signal System

Postby WonderlandMan » Tue Sep 28, 2004 8:58 pm

Does anyone have any information on the Signal System the CR uses, just curious...Because I notice when there arent any trains close the signals dont light up, but when a train nears the lights go on and display the info
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Postby Diverging Route » Tue Sep 28, 2004 10:33 pm

They're called "approach signals." It's designed to increase bulb life. When a train enters the block in advance of the signal (which is always well enough in advance so that the engineer never sees a dark signal), they illuminate. After the train passes the signal, they go dark (unless there is another train in the block).

The signals on the Lowell line at the Anderson/Woburn station had been approach signals for a few years, but as of about two weeks ago, they've reverted to full-time illumination. I asked a conductor about that, and he said that MBCR has been making such changes, but he didn't know why.
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Postby MBTA F40PH-2C 1050 » Wed Sep 29, 2004 1:10 pm

on the Amtrak mainline (Attleboro-Providence line) the signals are constantly illuminated due to the constant flow of traffic i guess
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Postby doublebell » Wed Sep 29, 2004 3:09 pm

The newer signals are a LEDs so that bulb life and power consumption are not major issues,

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Postby CSX Conductor » Thu Sep 30, 2004 9:13 am

I cannot recall the exact name for that type of signal system, but they are not called "Approach signals". The B&A on CSXT also has this type of signal system between CP-21 and the automatic signal @ MP 2 behind Fenway Park.

An "Approach" signal is a signal aspect which means to approach the next signal prepared to stop.

If the signal is not located at an interlocking, it would be referred to as a "Distant Signal".
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Postby Rockingham Racer » Thu Sep 30, 2004 1:15 pm

How about "approach lit" as a term?
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