Classification Wheel Driving Originally
Symbol Arrangement Wheel Assigned
Diameter Number Series
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A 4-4-0 63" or less 100 — 199
B 4-4-0 over 63" 200 — 399
C 2-6-0 52" or less 400 — 469
D 2-6-0 52" to 58" 470 — 529
E 2-6-0 over 58" 530 — 999
F 4-6-0 52" or less 1000 — 1015
G 4-6-0 52" to 58" 1016 — 1199
H 4-6-0 58" to 63" 1200 — 1499
I 4-6-0 over 63" 1500 — 1799
J 4-6-2 70" or less 5000 — 5499
K 4-6-2 over 70" 5500 — 5999
K 4-6-4 all 5700 — 5999 (August 1930)
L 2-8-0 52" or less 1800 — 1804
M 2-8-0 52" to 58" 1805 — 2200
N 2-8-0 over 58" 2201 — 2999
O 0-6-0 all 7000 — 7999
P 0-8-0 all 8000 — 8499
Q Oil-electric switchers 7700 — 7999 (May 1930)
R 2-8-2 58" or less 3000 — 3199
S 2-8-2 over 58" 3299 — 3999
T 2-10-2 all 4000 — 4999
U 4-8-2 all 6000 — 6999
U 4-8-4 all 6100 — 6999 (May 1927)
V Oil-electric road locomotives 9000 — 9099 (October 1928)
W 0-10-0 all 8500 — 8599
X Miscellaneous all 1 — 99
Z Straight electric locomotives 9000 -9999
