Atchison, Topeka and Santa Fe No. 2903
Specifications
| Road Name | Atchison, Topeka and Santa Fe Railway |
| Number | 2903 |
| Original Railroad | Atchison, Topeka and Santa Fe Railway |
| Builder | Baldwin Locomotive Works, Philadelphia, PA (builder's no. 69791) |
| Build Date | 1943 |
| Wheel Arrangement | 4-8-4 "Northern" |
| Gauge | 4 ft 8.5 in standard gauge |
| Weight | Approx. 882,000–975,000 lb (sources vary; loaded engine and tender) |
| Tractive Effort | 66,000 lbf |
| Boiler Pressure | 300 psi |
| Driver Diameter | 80 in |
| Years Operated | 1943–1961 |
| Current Status | Complete, cosmetically restored; not operational (static display) |
| Current Location | Union, Illinois |
| Current Owner | Illinois Railway Museum |
No. 2903 is a 4-8-4 “Northern” type steam locomotive built in 1943 by the Baldwin Locomotive Works (builder’s number 69791) for the Atchison, Topeka and Santa Fe Railway’s 2900 class, the largest and most powerful passenger steam locomotives Santa Fe ever owned. With 80-inch drivers, a 300-psi boiler and roughly 66,000 lbf of starting tractive effort, the 2900-class engines were built for speed as much as power, continuing a Santa Fe tradition of prioritizing fast schedules that dated back to the railroad’s legendary 1905 “Coyote Special” run. At over 121 feet long and nearly 900,000 lb loaded, No. 2903 ranks among the largest steam locomotives ever preserved.
No. 2903 worked both passenger and heavy freight assignments across the Santa Fe system from 1943 until the railroad’s full dieselization retired it in 1961, after eighteen years of service. Rather than being scrapped, it was donated for public display at the Museum of Science and Industry in Chicago, where it stood outdoors as a static exhibit for more than three decades, from 1961 to 1995.
In 1995 the Illinois Railway Museum in Union, Illinois acquired No. 2903 from the Museum of Science and Industry and moved it to the museum’s grounds, where it has since undergone cosmetic restoration and preservation work. It is currently displayed complete but not operational, and is one of the centerpiece exhibits of IRM’s large steam collection — the biggest and heaviest steam locomotive in the museum’s roster, and a rare surviving example of Santa Fe’s fleet of big, fast Northern-type passenger power.