TM 55-2200-001-12
Change 2
Section No. 1-General Rules (Rev.-9-1982)
1. Flat cars with both fish-belly center and fish-belly side sills and all fiat cars built after January 1, 1965.
Less than 18 ft
75 percent
18 ft. or over
100 percent
(f)
The weight concentration percentages shown in (e) are based on the center of load weight (that is, the
center of gravity of the load) being located on the center of the car length. The center of the load weight must not be
nearer to either truck center than the distance shown below:
When 66.6%
-one-fourth distance between truck centers.
load
weight 75%
-One-third distance between truck centers.
is
reduced 87%
-Three-sevenths distance between truck centers.
to 90'%
-Nine-twentieths distance between truck centers.
(g) The distance between crosswise bearing pieces (center to center) under lapped or staggered portion must be
placed so as to prevent excessive concentration of weight over specified spaces shown in the above tables.
(h) Bearing pieces, lengthwise of car, of suitable strength and length to provide for extended distribution of
weight over the specified spaces, shown in the above tables, may be used.
(i) When crosswise bearing pieces are used, the distance between the outside bearing pieces (center to center)
must not be less than the minimum distance specified in the above tables.
2. Flat cars not equipped with both fish-belly center and fish-belly side sills built prior to January 1, 1965.
10 ft. or less ..................................................................66.6 percent
Over 10 ft. to 24 ............................................................75 percent
Over 24 ft. to truck centers ............................................90 percent
Truck centers and over ..................................................100 percent
3. Gondola cars.
Less than 18 ft................................................................ 75 percent
18 ft. to less than 24 ft.................................................... 87 percent
24 ft. or over .................................................................. 100 percent
D-16
