Blue line signal question

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Blue line signal question

Postby MBTA F40PH-2C 1050 » Sun Oct 31, 2004 11:05 am

what does a yellow light over a white line mean on the blue line? when i train was ahead of another, the signals went:

red
yellow
yellow over Lunar
green
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Postby MBTA F40PH-2C 1050 » Sun Oct 31, 2004 11:07 am

oh and another question, when we left the state station on the blue line, heading towards gov't center, we lef the station and, you guys know how there is a sharp curve after the state station going to gov't, well there was a little green light before the curve at the state platform (the outbound side? the airport direction track),

does this green light mean the station isn't occupied by a train?
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Postby CSX Conductor » Sun Oct 31, 2004 2:20 pm

Finally exploring the big city, huh country boy? LOL :P

I still haven't figured those out yet. :(

You take photos of the line while you were up this way?
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Postby MBTA F40PH-2C 1050 » Sun Oct 31, 2004 2:48 pm

i took pics of the new blue line station, and North station, and got pics of some Red, orange blue and green line trains, i'll post them on NERAIL later on
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Postby The Collector at Court St » Sun Oct 31, 2004 7:28 pm

Yellow over white is a timing signal. Go the proper speed and the next red will clear.

If you were approaching a stopped train, you may (but not always) see:

1. a green signal meaning the next signal will either be green, yellow or timing.

Then 2. a yellow over white (timing) which means the next red will clear if you go below a certain speed.

Then 3. a yellow light which means the next light can hold red.

Then 4. a red which means you have something blocking the track at least two blocks ahead. (May be more than 2 blocks depending on the area.)
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Postby Robert Paniagua » Sun Oct 31, 2004 7:31 pm

And to add to that, this signal system is identical to ALL of NYCTA's New York City Subway network, which is a far cry from the Red Line, which speed are dictated by the ATO cab signals. The blue however, a motorperson may go any desired speed, but no more than 44 in the open, 54 in the Boston Harbour Tunnel Crossing.
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Postby CSX Conductor » Sun Oct 31, 2004 10:35 pm

New York City's signal system is closer to being like those of NORAC Rules.

http://nycsubway.org/tech/signals/index.html
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Postby MBTA F40PH-2C 1050 » Wed Nov 10, 2004 11:07 pm

what is the blue lines max speed in the tunnels between Maverick and Airport? the section that is under water?
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Postby Robert Paniagua » Thu Nov 11, 2004 8:27 am

around 100 km/h (61 mph).

although AFAIC trains travel on that stretch just under that speed.
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Postby MBTA F40PH-2C 1050 » Thu Nov 11, 2004 9:16 am

AFAIC? what does that stand for?
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Postby Robert Paniagua » Thu Nov 11, 2004 9:18 am

As Far as I'm Concerned.

While AFAIK means As Far As I Know

BTW=By the Way

FYI= For Your Information

IIRC=If I remember correctly

FWIW=For What it's worth
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Postby MBTA F40PH-2C 1050 » Thu Nov 11, 2004 10:40 am

o ok i thought AFAIC was a type of car :-) woops haha
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Postby Robert Paniagua » Thu Nov 11, 2004 10:42 am

Nah Don't worry about it, my friend!! :-D

Happens all the time.
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Postby The Collector at Court St » Thu Nov 11, 2004 1:49 pm

what is the blue lines max speed in the tunnels between Maverick and Airport? the section that is under water?


The Blue Line trains are set to cut power at 40 mph. It is possible to go slightly faster if you hit that speed going down hill.

Between Maverick and Airport, you can't go much faster than 35. Airport to Maverick, 40 or sightly faster for a short stretch.

Mav to Aquarium, maybe 43 or 44, but you'll have to slow for a timing signal.

Aqua to Mav, 39, because of timers.
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Postby Robert Paniagua » Thu Nov 11, 2004 8:55 pm

If the timers can be readjusted/modified, then that speed could be raised to 61 mph for the underwater portion....Just a thought.
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