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| Re: Uh oh.. Northbound A Train Was Travelling on Southbound Tracks--- There Was No Fog on the Tracks (1309807) | |||
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Re: Uh oh.. Northbound A Train Was Travelling on Southbound Tracks--- There Was No Fog on the Tracks |
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Posted by Stephen Bauman on Wed Aug 27 22:37:04 2014, in response to Re: Uh oh.. Northbound A Train Was Travelling on Southbound Tracks--- There Was No Fog on the Tracks, posted by Andrew Saucci on Wed Aug 27 21:19:52 2014. The emergency brakes on the NTSB test trains failed to meet the TA's 3.2 mph/sec standard by a lot.There was a fair amount of research done for making the PCC streetcar. One bit of research was how much acceleration/braking passengers could tolerate without the injuries you described. Their discovery was that much higher acceleration/braking rates were possible, so long as the acceleration was constant - i.e. no jerk. Consequently, the acceleration and service braking rates for the PCC's was 4.0 mph/sec. These were also the rates used by the BMT's experimental and Multi's. The PCC's were not magnets for whiplash law suits. There is some truth in what you said. The PCC's also used track brakes for emergencies (as did the Bluebirds). That's about 7 mph/sec. I experienced their unexpected application about 50 years ago, while taking a trip on Boston's Riverside Line. I was the only standee and was thrown half the length of the car. I sustained no real injuries. The golfer, who was playing his hole on the tracks at the Woodland Golf Course, would not have been as lucky. |
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