| Total weight, tons | 53.80 | 58.61 | 60.80 | 47.00 |
| Tons per ft. over all | 1.60 | 1.68 | 1.70 | 1.55 |
| Tons per ft. of wheel base | 2.45 | 2.52 | 2.23 | 3.03 |
| Maximum axle load, tons | 17.54 | 15.29 | 17.10 | 15.77 |
Farr has drawn diagrams of bending moment for forty different very heavy locomotives on different spans, and has determined for each case a uniform load which at every point would produce as great a bending moment as the actual wheel loads. The following short abstract gives the equivalent uniform load which produces bending moments as great as those of any of the engines calculated:—
| Span in Ft. | Load per ft. run equivalent to actual Wheel Loads in Tons, for each Track. |
| 5.0 | 7.6 |
| 10.0 | 4.85 |
| 20.0 | 3.20 |
| 30.0 | 2.63 |
| 50.0 | 2.24 |
| 100.0 | 1.97 |
Fig. 36 gives the loads per axle and the distribution of loads in some exceptionally heavy modern British locomotives.
In Austria the official regulations require that railway bridges shall be designed for at least the following live loads per foot run and per track:—
Span. | Live Load in Tons. | ||
Metres. | Ft. | Per metre run. | Per ft. run. |
1 | 3.3 | 20 | 6.1 |
2 | 6.6 | 15 | 4.6 |
5 | 16.4 | 10 | 3.1 |
20 | 65.6 | 5 | 1.5 |
30 | 98.4 | 4 | 1.2 |