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AAR Intermodal Interchange Rules
LOCATIONS, MARKINGS, AND AEI
SECTION N
SECTION N
LOCATIONS, MARKINGS, AND AEI
171. Location Designations
For uniformity in reporting location of unit parts in connection with inspection or repairs, the
following will govern. Such location designations shall be shown on all repair bills, forms, or reports
submitted where location information is involved.
a. Front/Rear
The end of the unit to which the tractor power unit is attached shall be known as the front end,
and the opposite end shall be known as the rear end.
b. Sides and Top
Sides and top of units are designated as front, center, and rear depending on the type of
equipment. For a van or chassis, the dolly legs forward is the front (LSF, RSF, TF), the dolly legs
to the tires is the center (LSC, RSC, TC), and the tires to the back is the rear (LSR, RSR, TR).
For a container with stacking posts, the front stacking post forward is the front (LSF, RSF, TF),
between the stacking posts is the center (LSC, RSC, TC), and the rear stacking post to the back
is the rear (LSR, RSR, TR). For 20 ft and 40 ft containers, the sides and top are designated as
center (LSC, RSC, TC).
c. Tires and Axles
Facing the rear end of the unit, the side to the right shall be known as the right side, and wheels,
tires, rims, etc., shall be known as right outside rear (ROR), right inside rear (RIR), right outside
quad (ROQ), right inside quad (RIQ), right outside center (ROC), right inside center (RIC), right
outside front (ROF), and right inside front (RIF).
Similarly, the side to the left shall be known as the left side, and locations shall be known as left
outside rear (LOR), left inside rear (LIR), left outside quad (LOQ), left inside quad (LIQ), left
outside center (LOC), left inside center (LIC), left outside front (LOF), and left inside front (LIF).
If only a single axle assembly is involved, it shall be considered as "rear," and if a triple axle
assembly is involved, the designations shall be "front," "center," and "rear." If a quad axle
assembly is involved, the designations shall be "front," "center," "quad," and "rear." If single
wheels are involved instead of dual wheels, single wheels shall be designated as "outside."
1/1/2014
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