Yellowspoon wrote: Why does this exist at all? Was there some de-railment here and the MBTA, rather than correct the track, decided it was easier to consume the patron's time?
BandM4266 wrote:Sounds to me like this person needs to get a life! 6-8 seconds for a stop and proceed adds no time at all to a commute, the writer wasted more time writing up this article, presumably on company time then it took for the train to stop and move on!
TomNelligan wrote:Yellowspoon wrote: Why does this exist at all? Was there some de-railment here and the MBTA, rather than correct the track, decided it was easier to consume the patron's time?
Presumably these things were installed because the MBTA no longer trusts its motorpeople to observe posted speed limits in the tunnel, so the system gets dumbed down. But you're absolutely correct that the Green Line now is a lot slower than it was in PCC days.
F-line to Dudley via Park wrote:
Doesn't the outbound always-red near ex-Public Gardens incline also act as a brake check for the obstructed-view down grade into Arlington?
sery2831 wrote:F-line to Dudley via Park wrote:
Doesn't the outbound always-red near ex-Public Gardens incline also act as a brake check for the obstructed-view down grade into Arlington?
Exactly. They are all safety stop signs in the form of a signal. The full stop is to make sure the operator knows how the train is going to handle coming down grades into stations where there can be other stopped trains.
They are not speed control signals like the Blue Line.
TrainManTy wrote:The Blue Line's East Boston Tunnel under the harbor uses timing signals that control a train's speed without stopping it. If a train is going too fast, it will have to stop at the signal, but at the proper speed the signal will clear shortly before the motorperson would have to start braking for it. If the intent of the Green Line signals are simply speed control, I wonder why a full stop is necessary.
ExCon90 wrote:Signals timed to control speed are common all over the New York City Subway and PATH, and as TrainManTy commented it is perfectly possible to arrange them so that a train proceeding under control at the prescribed speed will see the signal clear up as it approaches, so that no stop is necessary. Apart from the other considerations mentioned, standing passengers, of whom there are many on the Green Line at all hours, find incessant stops and starts to be very irritating.
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