BandA wrote:sery2831 wrote:The main slow spots are in the tunnels. Making GPS technology work in the tunnels is the expensive part. There are MANY solutions to speeding up the underground part of the Green Line. The bottom line is funding. Until a system is funded, slow trains will have to do.
[OT]No satellites in tunnels - switch to RFID or aGPS (cell phone tower positions). How about express tracks, ATO combined with banked turns in tunnel = excitement
OK let's start making sense here. ATO slows things down - Banked turns speed things up. Try a false stop code on the turns entering South Station on the Red Line. It is disconcerting to sit or stand on a stopped train on a curve which was designed for 35 mph. And even with a clear track, the cab signals only allow 25! Same goes for Harrison Sq., currently on a 10 code. Meanwhile the equipment can go faster and faster. Something's wrong here.
The Tremont Street Subway was designed for cars capable of 25 mph - downhill with a tail wind. Initially there were NO signals and the cars had hand brakes only. Accidents were few and far between and the subway carried twice the traffic it does today. The motormen were perched on a small wooden platform, with only a tiny cast-iron bumper between them and splinters. Open cars were operated from May to September, with rush hour passengers on the running boards, "Hang on, were coming into Boylston". With all these opportunities for disaster, the Elevated won a safety prize so many times that they were banned from competing!
Faster equipment has been the biggest contributor to the recent accident rate, yet there was only one accident at high speed! The problem is that it is harder to perceive speed in the sturdy cab of a Type 7 or 8. The motorperson's eyes belong on the track ahead, not on the speedometer.
Going back to the
275 Type 4s - two major accidents, both brake failures on hills when the cars were elderly.
405 Center Entrance cars - zero major accidents.
471 Type 5s - zero major accidents
346 PCCs - quick accelleration
1941 Car tipped over on curve
1954 Split switch - hit el column
1964 Rear ender at Copley Junction
1967 Rear ender on Lechmere Viaduct
and more…
We know how many involve Type 7 and 8 cars.
And each new car type incurs more damage -which is less repairable.
Something is wrong here.
Gerry. STM/BSRA
The next stop is Washington. Change for Forest Hills Trains on the Winter St. Platform, and Everett Trains on the Summer St. Platform. This is an Ashmont train, change for Braintree at Columbia.