USRA Heavy Santa Fe
The USRA Heavy Santa Fe was a USRA standard class of steam locomotive designed under the control of the United States [Railroad Administration], the nationalized railroad system in the United States during World War I. These locomotives were of 2-10-2 wheel arrangement in the Whyte notation, or 1′E1′ in UIC classification; this arrangement was commonly named "Santa Fe" in the United States. At the time, the Santa Fe was the largest non-articulated type in common use, primarily in slow drag freight duty in ore or coal service.
A total of 175 of these locomotives were constructed under the auspices of the USRA. They went to the following railroads:
| Railroad | Quantity | Class | Road numbers | Notes |
| Bessemer and Lake Erie Railroad | 5 | D2A | 521–525 | |
| Chicago, Burlington and Quincy Railroad | 10 | M-3 | 6300–6309 | At times leased to the Colorado and Southern Railway |
| Erie Railroad | 25 | R-3 | 4200–4224 | |
| Colorado and [Southern Railway] | 5 | E-5B | 905–909 | |
| Pennsylvania Railroad | 130 | N2s | Random between 7036 and 9859 | |
| Total | 175 |
The Pennsylvania Railroad locomotives were later refitted with the Pennsy's trademark Belpaire fireboxes. None of the originals built under USRA auspices or any of the subsequent copies were preserved.