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 AAR Mechanical Designations.

These designations are intended to group cars by general type, and appear to have been introduced in 1910, although it was a number of years before all railways designated their cars in the Official Railway Equipment Register. This list includes all major types, but since a number of revisions remain to be referenced some minor types and changes may not be present.

F - Flat Car

G - Gondola Car

H - Hopper Car

L - Special Car

M - Maintenance of Way

N - Caboose

R - Refrigerator Car

S - Stock Car

T - Tank Car

V - Ventilator Car

X - Box Car