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"double" brake systems
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akerboomk
A question on well flats & depressed center flats with "double" brake systems
Examples: https://www.bmrrhs.org/flat_5000_series/ https://www.bmrrhs.org/flat_5100_series/ So depressed center and well flats sometimes had independent brake systems for each end (I assume due to issues trying to run brake rods along the length of the car) - Brake cylinder was smaller (2 - 7 x12 cylinders instead of one 10x12 or whatever) - I assume "triple valve" (at least externally) was identical to "normal" car? - But what about the air tanks - were the 2 tanks the same as "normal" cars, or were they smaller? Thanks... -- Ken Akerboom |
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Hudson Leighton
I know of a Crane and a Passenger Car with "Double Brake Systems"
They have 2 of everything including the Triple Valves. Tracing air problems on the Passenger Car was fun, you would be following a pipe and it would end up at the wrong air system. -Hudson |
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Alex Schneider
Depressed center flat cars commonly used dual brake systems.
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While this isn't freight cars, many heavyweight Pullmans had dual cylinder brake systems, each acting on one truck, with a common control valve. In some cases they had dual emergency reservoirs but a common service reservoir. Some were original equipment, others installed when a car was rebuilt and/or air conditioned. Some Pullmans built between 1912 and 1917 had PC brake systems with separate service and emergency cylinders. A system of levers enabled both cylinders to work on both trucks. Bottom line, there is no substitute for a photo of the car you are modeling.
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Earl Tuson
Depressed center flat cars commonly used dual brake systems.Perhaps, but some did have 2 cylinders with one reservoir and one control valve: http://www.alphabetroute.com/nynhh/frtdgms/17050-17059.pdf Those NH cars had been updated with AB some time later in life, as they'd come with K when assembled in 1929. Earl Tuson |
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akerboomk
To answer my own question (at least for the 5100 series depressed center flats)
One of these cars was recently found in Salem, MA I was able to photograph it Monday, and it is like the NH car that Earl pointed out - One brake valve - One air reservoir - 2 7x12 brake cylinders (there is a "T" in the line from the brake vale to the cylinders) (do they look tiny!) - 2 hand brakes (one for each truck) -- Ken Akerboom |
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Alex Schneider
Very interesting information from your field work. It isn't easy to do that unless a car is in a museum.
Did the MCB or later the AAR mandate how much brake effort a car should have, presumably based on loaded weight? I have seen such tables from Pullman for its own cars, but on passenger cars the weight of the passengers wasn't specifically considered.
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Randy Hees
The formulas for brake force came from New York Air or Westinghouse literature. In general you are supposed to have braking forces of 80% of the car's weight (to avoid wheels from sliding) I suspect that the weight of passengers, as a proportion of the weight of a passenger car was small enough to be ignored. Possibly not on a baggage car.
Randy Hees |
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