Freight Cars -- Truck Classification

Interpretation of Classification

Symbol	Refers to
First	Number of axles per truck
Second	A.A.R. Class letter for journal dia. only
Third	Dash-for standard A.A.R. axle number-for numerical deviation from A.A.R. standard
Fourth	Service of truck. F=Freight
Fifth	Consecutive design of truck for class
Sixth	Modification to truck design

A.A.R. Class	A	B	C	D	E	F
Journal size	33/4"x7"	41/4"x8"	5"x9"	51/2"x10"	6"x11"	61/2"x12"
Capy. per axle	15000	24000	32000	40000	50000	60000

Interpretation of Description

	Frame
A.B.	Arch bar
S.C.	Cast steel

	Springs
C	Coil only
E	Elliptic only
C-E	Coil elliptic-termed non-harmonic
C-SE	Coil semi-elliptic
C-S	Coil snubber (one snubber unit in spring group)
SE	Semi-elliptic

	Brake
CL	Clasp
S	Single (Spreader under spring plank)
O	Spreader through bolster
O	Spreader through bolster and horizontal lever

	Dimensions
W.B.	Wheel Base
H	Height center plate from rail, empty car
	Wheels 33" dia. unless otherwise noted

Class of Trucks	Frame	Wheel Base	H	Springs	Brake	Weight per truck	Class of Car
2A-F1	A.B.	5'-0"	275/8"	E	S	5700	NDa, N4, N5
2A-F2	S.C.	5'-0"	275/8"	E	S	5500	NDa, N5
2A-F3	S.C.	5'-0"	275/8"	C-E	S		N5, N5a, N5d
2A-F4	S.C.	5'-0"	275/8"	C-E	O	5650	N5, N5b
2A-F5 B.W.	S.C.	5'-3"	275/8"	C-E	O	5650	N5b, N5c, N6b, NDa
2B1F2	A.B.	5'-0"	275/8"	E	S	5850	N6a, N6b
2C-F1	A.B.	5'-6"	275/8"		S	7350	FL, F24, S5, XLh
2D-F1	A.B.	5'-6"	275/8"	C	S	7750	FM, GLa, GLb, GLc, GP, GPa, GR, GRa, GS, GSa, GSc, GSd, GSx, H22, XL, XLa, X23, X24, X25, X25a, X28a, X29
2D-F2 CROWN	S.C. Andrews	5'-6"	275/8"	C	S	7950
2D-F3 U.S.R.A.	S.C. Andrews	5'-6"	251/2"	C	S	8100	GLd, G24, X26, X26a, X26c
2D-F3a U.S.R.A.	S.C. Andrews	5'-6"	251/2"	C-E	S
2D-F4	S.C.	5'-6"	263/4"	C	S	7500	X28a, X29
2D-F4a	S.C.	5'-6"	263/4"	C-E	S	7500
2D-F5 (30" dia wheels)	A.B.	5'-6"	221/2"	C	S		F21, F21a, F21b, F21c
2D-F7	S.C.	6'-0"	263/4"	S-E	S	11300	X29 (Express service)
2D-F8	S.C.	5'-6"	271/4"	C	S	7500	FM, GLa, GLb, GLc, GLe, GLf, GLg, GP, GPa, GR, GRa, GS, GSa, GSc, GSd, H22, K7, K8, U6, XL, XLa, XLc, X23, X23a, X23b, X24, X25, X25a, X25b, X25c, X25d, X28a, X29, X29a, X30
2D-F8a	S.C.	5'-6"	271/4"	C	S	7500	U4
2D-F8 (mod)	S.C.	5'-6"	271/4"	SYM.GTN.	S	7500	FM
2D-F9	S.C.	5'-6"	255/8"	C	S	7500	TM8, TM10
2D-F10	S.C.	5'-6"	27"	C-E	S	7500	FM, X29, X35
2D-F11	-	-	-	-	-	-	(not used)
2D-F12	S.C.	5'-6"	271/4"	C-E	S	7500	FM, F32, GLa, GS, K7a, XL, X23, X25, X25a, X28a, X29, X31, X31a, X31b, X31c, X31f, X32, X32a, X32b, X32c, X33, X33a, X36
2D-F13 National	S.C.	5'-6"	267/8"	C-SE	S	7500	X31, X31a, X31f
2D-F14 Young	S.C.	5'-6"	271/4"	C-SE	S	7150	X29
2D-F15	-	-	-	-	-	-	(not used)
2D-F16 Double Truss	S.C.	5'-6"	263/4"	C-E	S	7350	X29 (Express service)
2D-F17 Elsey	S.C.	5'-6"	263/4"	C-SE	O	7950	X29, one car
					O	8250	X38 75 cars 1940
2D-F17a	S.C.	5'-6"	263/4"	C-SE	O	8550	X29a, X37b, X38, H31, X38a
2D-F18	S.C.	5'-6"	271/4"	C-E	O	7350	(tenders)
2D-F19	S.C.	5'-6"	271/4"	C-E	O	7350	X37
2D-F20 National	S.C.	5'-6"	263/4"	C-SE	O	7250	X37, X37a, X37b
2D-F21 Young	S.C.	5'-6"	271/4"	C-SE	O	7300	X37b, X38
2D-F21a	S.C.	5'-6"	263/4"	C-SE	O	7350	X37b, X38a
2D-F22 Barrett Whitehead	S.C.	5'-6"	263/4"	C-SE	O	7650	X29, X38
2D-F22a	S.C.	5'-6"	263/4"	C-SE	O	7650	X37b, X38, X38a
2D-F22b	S.C.	5'-6"	263/4"	C-SE	O	7650	X38a
2D-F22c	S.C.	5'-6"	263/4"	C-SE	O	7800	X38, H31
2D-F22d	S.C.	5'-6"	263/4"	C-SE Helper spring	O
2D-F23 Allied full-cushion	S.C.	5'-6"	263/4"	C Pedestal	CL	9400	X38, G29b, P30a, X32(kitchen)
2D-F24 Buckeye all-service	S.C.	5'-6"	263/4"	C-SE	O	8100	X37b, X38b
2D-F25 A.S.F. ride control	S.C.	5'-6"	263/4"	C	O	7150	X38
2D-F26 A.S.F. A-3 ride control	S.C.	5'-6"	253/4"	C 31/16" trav.	O	6350	X40, X40a, X41, X41a
2D-F26a A.S.F. A-3 ride control	S.C.	5'-6"	253/4"	C 313/16" trav	O	6350	X40b, X41a, X41b
2D-F27 National B-1 dual control	S.C.	5'-6"	253/4"	C	O		none
2D-F28 B-W	S.C.	5'-6"	263/4"	C 33/16" trav	O		EXP
2D-F28a B-W	S.C.	5'-6"	253/4"	C 313/16" trav	O		EXP
2E-F1(mod)	S.C.	5'-8"	275/8"	C	S	9000	H21a
2E-F2 Crown	S.C. Andrews	5'-10"	275/8"	C	S	9550	F25, F25b, G22, G22a, H21a, H21b, H25, H22a, FN, FNa
2E-F2 Crown	S.C. Andrews	5'-10"	275/8"	C-S	S	9550	G21, G22, G22a, H21b, H22a, H30
2E-F2a	S.C. Andrews	5'-10"	275/8"	C-E	S		H21a, H21d, H22a, H25, H30
2E-F3 U.S.R.A.	S.C. Andrews	5'-8"	251/2"	C	S	9550	G25, G25a
2E-F3a	S.C. Andrews	5'-8"	251/2"	C-E	S
2E-F4	S.C.	5'-8"	263/4"	C	S	9000	F30, G26
2E-F4a	S.C.	5'-8"	263/4"	C-E	S		F30, G26
2E-F5 Dalman	S.C.	5'-8"	275/8"	C	S	8850	H21a, H22a
2E-F6	S.C.	5'-10"	275/8"	C	S	9350	H25
2E-F6a	S.C.	5'-10"	275/8"	C-E	S
2E-F7 National	S.C.	5'-6"	275/8"	C	S	9250	G26
2E-F8 Dalman	S.C.	5'-8"	263/4"	C	S	9100	G26
2E-F9	S.C.	5'-8"	267/8"	C-E	S		F31, F31a
2E-F10 Double truss	S.C.	5'-8"	263/4"	C-E	S	8500	F30a, F30c, G27, H30
2E-F11 National	S.C.	5'-6"	263/4"	C-SE	S	8300	G27, H30
2E-F12 Young	S.C.	5'-8"	263/4"	C-SE	S	8500	G27, H30
2E-F13 Double truss	S.C.	5'-8"	263/4"	C-E	O	8600	G27, (F30a, 1 car)
2E-F14 National	S.C.	5'-6"	263/4"	C-SE	O	8350	G27, H30
2E-F15 Young	S.C.	5'-8"	263/4"	C-SE	O	8550	G27, H30
2E-F16 Double truss	S.C.	5'-8"	263/4"	C-E	O
2E-F17 National	S.C.	5'-6"	263/4"	C-SE	O	8300	G26a, G28, G29, G27, G30
2E-F18 Young	S.C.	5'-8"	263/4"	C-SE	O	8550	G26a, G28, G29, G29a
2E-F19 Barrett Whitehead	S.C.	5'-8"	263/4"	C-SE	O	8800	G28, G29, G30, F37
2E-F20 Elsey	S.C.	5'-8"	263/4"	C-SE	O	9850	G28, G29
2E-F21 National type B-1	S.C.	5'-8"	263/4"	C	O	8200	G30
2E-F22 A.S.F. A-3 ride control	S.C.	5'-8"	253/4" 14" dia	C	O		H30, 1946
2E-F23 National B-1 dual control	S.C.	5'-6"	253/4" 14" dia	C	O		None
2F-F1 Crown	S.C. Andrews	5'-10"	275/8"	C	S	10300	F25a, H24
2F-F2	S.C.	5'-8"	263/4"	C	S	10500	F22, F23, H27
				C-E	O		F22, G22b
2F-F3 Dual trucks span bolster	S.C.	5'-0" single truck unit	25"	C	O	10000 single truck unit	F34
		10'-0" span bolster	35"	-	-	25800 complete
2F-F4	S.C.	5'-8"	263/4"	C-E	O	10000	G22b, F30
2F-F5 B.W.	S.C.	5'-8"	263/4"	C-SE	O	10400	G22b
3E-F1	S.C.	9'-0"	275/8"	C	CL	17200	G23, H26
3F-F1	S.C.	9'-0"	275/8"	C	CL	19800	F28, F29
3F-F2 Buckeye	S.C.	9'-0"	275/8"	C	CL	20850	F29
3F-F2 Buckeye	S.C.	9'-0"	275/8"	C-S	CL	20850	F33, F35
3F-F3 Buckeye	S.C.	9'-0"	275/8"	C-S	CL	20900	F36, F33