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(1639914)

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WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by https://salaamallah.com/ on Wed Mar 12 16:56:51 2025

IS THE FLASHING GREEN LIGHT SUPPOSED TO BE SOME IMPROVEMENT

WHY NOT JUST A GOOD SOLID GREEN TIMER LIGHT

I FIRST SAW THIS BACK IN 1985 IN ATLANTA MARTA HEAVY RAIL

FLASHING GREEN LIGHTS

ANY GOOD REASON NOW NEW YORK SUBWAY DOES THIS NOW ??

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(1639915)

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Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by zac on Wed Mar 12 17:53:37 2025, in response to WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS'', posted by https://salaamallah.com/ on Wed Mar 12 16:56:51 2025.

It's to indicate that you are in CBTC territory. You are clear but CBTC controls all other movement as the signals are few and far between.

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(1639917)

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Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by https://salaamallah.com/ on Wed Mar 12 19:17:55 2025, in response to Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS'', posted by zac on Wed Mar 12 17:53:37 2025.

WAS THIS A '''IMPROVEMENT''' ??

WHAT WAS WRONG WITH REGULAR GREEN TIMERS

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(1639921)

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Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by gbs on Wed Mar 12 21:03:07 2025, in response to Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS'', posted by https://salaamallah.com/ on Wed Mar 12 19:17:55 2025.


Please don't use ALL CAPS. It's annoying to read and it looks like you're shouting.

In the NYC system, the flashing green is not a signal about proceeding like an ordinary green, and it is not a timer. The flashing green means that CBTC is active and controls the train movement. CBTC, not the flashing green, tells the operator whether to proceed and at what speed.

When a train passes an ordinary green signal, the signal turns to red and the stop arm comes up. This does not happen with CBTC. When a train passes a flashing green, it continues to flash green and no stop arm comes up.

Read about CBTC


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(1639922)

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Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by Jersey Mike on Thu Mar 13 00:13:26 2025, in response to WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS'', posted by https://salaamallah.com/ on Wed Mar 12 16:56:51 2025.

Cab speed, same as Metro North, SEPTA and Metra (kinda).

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(1639943)

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Re: WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS''

Posted by Lou from Brooklyn on Thu Mar 13 11:11:16 2025, in response to WHY ARE NYC SUBWAY SIGNALS ''FLASHING GREEN LIGHTS'', posted by https://salaamallah.com/ on Wed Mar 12 16:56:51 2025.

FOLLOW CAB SIGNAL INDICATION, FLASHING GREEN PRETTY COMMON ON DIFFERENT SYSTEMS NOW A DAYS. NYCTA YOU WILL ONLY FIND FLASHING GREEN WITH CBTC
FLASHING GREEN BUT YOUR CAN SIGNAL COULD SHOW APPROACH OR RESTRICTED IN RAILROAD PARLANCE

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