The Model C. Stanley Steamer series began production by the Stanley twins in 1903. The 'X' designation in the CX is for the larger engine and boiler than in the Model C. The CX was built from 1904 into early 1906. The 1905 models also appear in some Stanley literature as a 'Doctor's Ruabout.' This 1905 CX # 1273, was restored in the late 1970s after being found on a farm in Pennsylvania. It has been run on several Horseless Carriage Club of America Tours in California prior to coming to its current owner in Micghigan.
One of these Stanley Runabouts, a stock model, was used by F. E. Stanley for the 'Climb to the Clouds' competition at Mt. Washington, NH, in 1904. Mr. Stanley posted a time for the 8-mile climb of just over 28 minutes - second only in the competition to a 60 hp Mercedes.
| Year | 1905 |
| Make | Stanley |
| Model | CX |
| Engine Location | Rear |
| Drive Type | Rear Wheel |
| Combined MPG | 0.00 |
| Engine | 16 inch boiler |
| Aspiration/Induction | Normal |
| Horsepower | 8.00 HP (5.9 KW) |
| Fuel Type | Steam |
