“Great Western” No. 90
Specifications
| Road Name | Great Western |
| Number | 90 |
| Original Railroad | Great Western Railway of Colorado |
| Builder | Baldwin Locomotive Works, Philadelphia, PA |
| Build Date | June 1924 |
| Wheel Arrangement | 2-10-0 Decapod |
| Gauge | Standard gauge (4 ft 8½ in) |
| Weight | 212,000 lb total; 190,000 lb on drivers |
| Tractive Effort | 48,960 lbf |
| Boiler Pressure | 200 psi |
| Driver Diameter | 56 in |
| Years Operated | 1924–1967 |
| Current Status | Operational — most powerful historic steam locomotive running at Strasburg |
| Current Location | Strasburg, Pennsylvania |
| Current Owner | Strasburg Rail Road |
No. 90 was built in June 1924 by Baldwin as the largest and most powerful locomotive on the roster of the Great Western Railway of Colorado, a short-line sugar-beet hauling railroad. Its primary duty was pulling trains of loaded hopper cars of sugar beets to the processing mill at Loveland, Colorado.
On April 5, 1967, the Strasburg Rail Road purchased No. 90 for $23,000, seeking a larger, more powerful steam locomotive for its growing tourist excursion traffic in Lancaster County, Pennsylvania. Restoration to operating condition was completed by February 1968.
Today, Great Western No. 90 is one of only two operational Decapod-type (2-10-0) steam locomotives left in the United States and is the most powerful of the historic steam locomotives running at Strasburg, rated to pull loads up to roughly 1,211 tons. It continues to haul daily tourist excursion trains through the Amish farmland between Strasburg and Paradise, Pennsylvania, on America’s oldest continuously operating railroad. It completed its FRA-mandated 1,472-day boiler inspection and overhaul in March 2025.