TM 55-2200-001-12
Change 3
Section No. 1--General Rules (Rev.-9-1981)
Rule 16. Loads on One Car Overhanging One End or Both Ends of Car.
(a)
The length or load or width of overhanging portion of load, as shown in Tables 1 and 2, must not be exceeded.
(b)
Length of overhang is the distance from center of truck to the extreme end of overhanging portion of load. For
intermediate lengths of load not shown in table, use next longest length of load shown.
(c)
When the material in the overhang is of various lengths, the allowable width shall be based on the total width of
the overhang at the extreme ends. For placement of bearing pieces between bolsters and ends of car, see General Rule
4 (c).
(d)
Length of car as shown in tables means length over end sills. For intermediate lengths of cars not shown in
table, use next shortest length car shown.
(e)
Weight of load on one car, overhanging one end of car, must not exceed the percentage of load limit of carrying
car as shown in Table 1. Allowable weight of load must be obtained by multiplying the stenciled load limit of car by the
percentage shown In the table for the respective length of overhang and car.
(f)
When material is of unequal lengths and overhanging one end, the weight of load shall be based on the average
lengths of pieces in the overhang.
(g)
Long steel, liable to take a permanent set by bending, must be supported to prevent sagging.
(h)
Section No. 1, Figure References, Figures 5-A and 5-B, governs methods of narrowing loads of poles and
lumber to keep within clearance width limits as shown in Tables 1 and 2.
(I)
Authority must be procured from carriers for handling loads which measure more than 8 ft. from top of rail to
center of load (including bearing pieces) or those exceeding width and length as shown in Tables Nos. 1 and 2. Heights
specified in the figures must not be exceeded.
(j)
The following tables are based on 10 ft. 6 in. clearance width limits, 15 degree curvature and 3 inches tolerance
on each side of load.
(k)
Table calculations are based on truck centers being located 5 ft. 6 in. from end sills for cars 75 ft. In length or
less and 10 ft. 6 in. from end sills for cars over 75 ft. in length or truck centers as shown in the tables.
(l)
Table 1 is based on the end of load opposite the overhanging end being located 18 in. from the face of end sill
of car. In cases where the type of brake and load permits utilizing part or all of this space, thereby making the overhang
less than specified in the tables, the width of load and the percentage of load weight may be increased in accordance
with the shorter overhang. For placement of bearing pieces between bolster and ends of car, see General Rule 4 (c).
D-32.7
