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Hopper Car type.

"HC" - Hopper car equipped with coke racks (1/17-2/26).   "HD" - Hopper car equipped with side dump hoppers (1/17-2/26).   "HD" - An Open Top Car, having fixed sides and ends, and bottom consisting of hoppers dumping outside of rails and self-clearing (3/27-10/28).   "HD" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails. Doors each side of car arranged to operate in more than one unit (3/29-4/38).   "HD" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails (includes former "HDA", reclassified into "HK") (1/39-1/68).   "HDA" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails. Doors each side of car arranged to operate as a single unit (reclassified into "HD") (3/29-4/38).   "HE" - An Open Top Car, having fixed sides and ends, and bottom consisting of hoppers dumping between rails and not self-clearing (3/27-10/28).   "HE" - An Open Top Car, not self-clearing, having fixed sides and ends, level bottom with two or more divided hoppers with doors hinged crosswise of cars and dumping between rails (includes former "GR") (3/29-1/68).   "HF" - An Open Top Car, having fixed sides and ends; equipped with cross hoppers dumping between rails; also a side dump hopper extending from end of car to bolster, dumping outside of rail (3/27-10/28).   "HF" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged crosswise dumping between rails; also two divided hoppers extending from end of car to bolster, with doors hinged lengthwise of car and dumping outside of rails (3/29-1/68).   "HFA" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of divided hoppers at centre with doors hinged lengthwise, dumping outside and/or inside of rail; also one divided hopper, each end, extending from end of car to bolster with doors hinged lengthwise of car and dumping outside of rails. Centre doors each side of car operate as a single unit (3/29-4/38).   "HFA" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of divided hoppers at centre with doors hinged lengthwise, dumping outside and/or inside of rail; also one divided hopper, each end, extending from end of car to bolster with doors hinged lengthwise of car and dumping outside of rails (1/39-4/99).   "HFB" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of one or more divided hoppers at centre of car with doors hinged lengthwise dumping inside rail; also cross hoppers at ends with doors dumping between, or between and outside of rail (7/32-1/68).   "HK" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside and/or inside of rails. Doors each side of car arranged to operate as a single unit (3/29-4/38).   "HK" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside and/or inside of rails (1/39-1/68).   "HK" - Open top self-clearing car, having fixed sides and ends and bottom consisting of two or more divided hoppers dumping outside and/or inside or rails (includes former "HD") (1/73-4/99).   "HM" - Hopper Car. Similar is general design to gondola car, having sides and bottom ends and open at top, equipped with hopper bottoms and self-cleaning (1/17-2/26).   "HM" - An Open Top Car, having fixed sides and ends, and bottom consisting of double hoppers dumping between rails and self-clearing (3/27-10/28).   "HM" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two divided hoppers with doors hinged crosswise of car and dumping between rails (3/29-4/99).   "HMA" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as more than one unit (3/29-4/38).   "HMA" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails (includes former "HMB") (1/39-4/99).   "HMB" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as a single unit (reclassified "HMA") (3/29-7/43).   "HT" - Hopper (Twin). Similar to ordinary hopper, only equipped with two or more hopper doors instead of one (1/17-2/26).   "HT" - An Open Top Car, similar in construction to the "HM" car but having more than one set of double hoppers (3/27-10/28).   "HT" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged crosswise of car and dumping between rails (3/29-4/99).   "HTA" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as more than one unit (3/29-4/38).   "HTA" - An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails (includes former "HTB") (1/39-4/99).   "HTB" - An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as a single unit (reclassified "HTA") (3/29-4/38).   Notes:   1 - If any of these hopper cars are equipped with coke racks, the letter "C" should be affixed to the regular symbol to designate its special class of service (3/27-1/80).   2 - If any of these hopper cars are equipped with a roof or are covered for protection of contents the letter "R" should be affixed to the regular symbol to designate its special class of service (1/17-4/99).   3 - Where cars are equipped with permanent racks for stowing parts or are specially modified or equipped to provide for loading of a particular commodity, the letter "S" should be affixed to the applicable designating letters. A note should be included in the Official Railway Equipment Register to show the particular special equipment proposed for the car (1/49-4/99).