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Re: HEP & refer containers & Electro-Pneumatic Braking
Author: Dr Zarkoff
Date: 09-12-2008 - 21:49
> . . . I am bewildered by all of the initials and letter codes of the different systems.
Freight:
F-46, "Plain" triple valve (late 1870s), followed by:
HC = type H triple valve with auxiliary bolted to brake cylinder (late 1880s, early 1890s)
KC = same but using a K triple valve, c1900. Both had the variation HD and KD, in which the reservoir wasn't bolted to the cylinder (used mostly on hopper cars)
AB = Automatic Balancing, 1933 (use of the term "triple valve" discontinued in favor of "Control valve")
ABD = AB with Diaprhagms and spool valves, c1960
ABDW = ABD with the Wilson attachment, c1980 (continuous quick service, now obsolete)
ABDX = ABD with stabilized emergency portion, c1998
ABDXL = ABDX for Long cars, like TOFC and auto rack cars
Passenger:
PM = P triple with M brake cylinder (no graduated release possible), c1890
various high speed equipments, 1890-1910
LN = L triple valve with N type brake cylinder, c1910 (graudated release)
UC = Universal Control, c1918, using a U-12, U-12-BC, U-12-BD etc. unversal valve
D-22, D-24, c1935-1940
26-C, c1955 -- not counting the engineer's brake valves and associated control apparatus, the 26-C system for passenger cars is essentially the same as 26-L used on locomotives.
Locomotives:
A-1, late 1870s, automatic only
SWA, c1890, Straight air [engine brakes] With Automatic [train and engine brakes]
6-ET, c1895, 6th brake equipment for Engines and Tenders
7-ET, variation on 6-ET for Australia
8-ET, 8th brake equipment for Engines and Tenders (also retrofitted to some electrics)
14-EL, for Electric Locomotives
6-SL, 6-BL, etc: variations of 14-EL for diesel-electric service
24-RL, 24th brake system for Road Locmotives (also used on GG1s)
26-L, 26th locomotive braking system (the current one)
Yes, the numbers are sequential. The missing ones are specialty items or designs which never made it into prodcution. The 6-ET and 14-EL systems, and their variations, are essentially the same system. It's still made today, making it the longest lasting of WABCo's brake systems.
This isn't an all-inclusive nor exhaustive list, there are lots more, not to mention NYAB systems.
Freight:
F-46, "Plain" triple valve (late 1870s), followed by:
HC = type H triple valve with auxiliary bolted to brake cylinder (late 1880s, early 1890s)
KC = same but using a K triple valve, c1900. Both had the variation HD and KD, in which the reservoir wasn't bolted to the cylinder (used mostly on hopper cars)
AB = Automatic Balancing, 1933 (use of the term "triple valve" discontinued in favor of "Control valve")
ABD = AB with Diaprhagms and spool valves, c1960
ABDW = ABD with the Wilson attachment, c1980 (continuous quick service, now obsolete)
ABDX = ABD with stabilized emergency portion, c1998
ABDXL = ABDX for Long cars, like TOFC and auto rack cars
Passenger:
PM = P triple with M brake cylinder (no graduated release possible), c1890
various high speed equipments, 1890-1910
LN = L triple valve with N type brake cylinder, c1910 (graudated release)
UC = Universal Control, c1918, using a U-12, U-12-BC, U-12-BD etc. unversal valve
D-22, D-24, c1935-1940
26-C, c1955 -- not counting the engineer's brake valves and associated control apparatus, the 26-C system for passenger cars is essentially the same as 26-L used on locomotives.
Locomotives:
A-1, late 1870s, automatic only
SWA, c1890, Straight air [engine brakes] With Automatic [train and engine brakes]
6-ET, c1895, 6th brake equipment for Engines and Tenders
7-ET, variation on 6-ET for Australia
8-ET, 8th brake equipment for Engines and Tenders (also retrofitted to some electrics)
14-EL, for Electric Locomotives
6-SL, 6-BL, etc: variations of 14-EL for diesel-electric service
24-RL, 24th brake system for Road Locmotives (also used on GG1s)
26-L, 26th locomotive braking system (the current one)
Yes, the numbers are sequential. The missing ones are specialty items or designs which never made it into prodcution. The 6-ET and 14-EL systems, and their variations, are essentially the same system. It's still made today, making it the longest lasting of WABCo's brake systems.
This isn't an all-inclusive nor exhaustive list, there are lots more, not to mention NYAB systems.
