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