CHAPTER 5 THE RAILROAD CAR The Railroad Car The Essential Parts: Car body Bolsters
Suspension System Bearings Wheels The 8-wheel Car Couplers and air brake hoses There's more to a coupler than meets the eye. Most of it is inside the "draft sill," hidden from view. The "draft gear" helps absorb impacts. Brake hoses. joined by "gladhands," connect air brake lines from car to car. The "angle cock" manually opens and closes the air brake line on an individual car.
Mechanical Committee of the Standard Coupler Manufacturers illustration Standardization/Interchange Repairs Capacity/Load Limits Nominal Car Capacity Gross Rail Load (4-axle car)
Journals (diam. & length) 30-ton 60,000 lbs 103,000 4.25x8 in. Class B 40-ton
80,000 142,000 5x9 Class C 50-ton 110,000 177,000
5.5x10 Class 0 70-ton 154,000 220,000 6x11 Class E
100-ton 200,000 263,000 6.5x12 Class F 110-ton 220,000
286,000 7x12 Class G 110-ton 220,000 286,000 6.5x9
Class K 125-ton 250,000 315,000 7x12 Class G 125-ton
250,000 315,000 7x9 Class M Clearances (Dimensions) Plate B -- Plate K Safety - 1893 & 1970 & 1980 Components and Design
Component Nomenclature Suspension System Heavy-duty springs are used for suspension Standard springs used with varying amounts of inner coils for heavier loads Springs compress 2 to 4 inches when under load; more than this would affect couplings Rock-and-Roll Suspension System (continued)
Bearings and Wheels Springs are supported by a frame which connects directly to the axles Friction bearings used until 1963 Roller bearings replaced the friction bearings -Reduced maintenance -Required for interchange service to other railroads Wheels typically 33 or 36 in., based on weight (28 in. for some tall cars) Hotboxes Bearings and Wheels (continued)
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