CEMP-E
TI 850-02
AFMAN 32-1125(I)
1 MARCH 2000
typically far exceed the number of locomotive wheels over much of the track, and it is therefore the
magnitude of the car wheel load that should govern in most cases. In either case, both loading conditions
must be checked before final design.
c. The design wheel load is usually obtained by taking the static wheel load for the heaviest commonly
used car and adding a factor to account for the dynamic affects of travel speed combined with track and
wheel irregularities.
d. Table 2-2 lists suggested design wheel loads for planning purposes. To use the table, select the car
type in the first column that most closely matches the heaviest car in common use over the track. For
terminal areas and around an installation, where speeds will usually be limited to 10 mph, select the
design wheel load in the column labeled "<= 10 mph." For track connecting the installation with the
commercial carrier where train speed will likely exceed 10 mph, use the column labeled "10-25 mph." For
track mostly used by an engine during switching, or where mostly empty cars will be stored, or that will
otherwise see only occasional use, select from the column labeled "Light Use."
Table 2-2. Common Car Types and Design Wheel Loads
Design Wheel Load
Most Common Heavy Car
10-25 mph
<= 10 mph
Light Use
Box, 40T
20,000 lb
17,600 lb
16,000 lb
Box, 50T
26,250 lb
23,100 lb
21,000 lb
Box, 70T
34,375 lb
30,250 lb
27,500 lb
Flat, 40T
17,500 lb
15,400 lb
14,000 lb
Flat, 50 T
23,750 lb
20,900 lb
19,000 lb
Flat, 80T (6-axle)
23,750 lb
20,900 lb
19,000 lb
Flat, 100T (6-axle)
32,500 lb
28,600 lb
26,000 lb
Flat, 140T (6-axle)
38,750 lb
34,100 lb
31,000 lb
COFC, 70T
30,000 lb
26,400 lb
24,000 lb
COFC-Double Stack
50,000 lb
44,000 lb
40,000 lb
TOFC, 70T
30,000 lb
26,400 lb
24,000 lb
Gondola, 40T High Side
18,750 lb
16,500 lb
15,000 lb
Gondola, 50T
22,500 lb
19,800 lb
18,000 lb
Tank, 7500 gallon
16,250 lb
14,300 lb
13,000 lb
Tank, 10,000 gallon
22,500 lb
19,800 lb
18,000 lb
Tank, 20,000 gallon
36,250 lb
31,900 lb
29,000 lb
Hopper, 50T
21,250 lb
18,700 lb
17,000 lb
Hopper, 70T
30,000 lb
26,400 lb
24,000 lb
Hopper, 100T (263 K)
41,125 lb
36,190 lb
32,900 lb
Hopper, 120T (286 K)
44,750 lb
39,380 lb
35,800 lb
Hopper, 125T (315 K)
49,250 lb
43,340 lb
39,400 lb
Locomotive, EMD GP-7 or 9
37,500 lb
33,000 lb
30,000 lb
Locomotive, EMD SW-8
31,250 lb
27,500 lb
25,000 lb
Locomotive, DAV-BES 80T
25,000 lb
22,000 lb
20,000 lb
Locomotive, GE 65T
20,000 lb
17,600 lb
16,000 lb
Locomotive, GE 40T
13,750 lb
12,100 lb
11,000 lb
Locomotive, GE 25T
31,250 lb
27,500 lb
25,000 lb
2-4
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