| Caledonian Railway 49 and 903 Classes | |
| Powertype: | Steam |
| Designer: | John F. McIntosh |
| Builder: | St. Rollox Works |
| Whytetype: | 4-6-0 |
| Uicclass: | 2′C n2 |
| Driverdiameter: | 6inchesft6inchesin (ftin) |
| Locoweight: | 701NaN1 (as built) 71.51NaN1 (as rebuilt) |
| Tenderweight: | 551NaN1 |
| Boilerpressure: | 200 psi when built, 175 psi as rebuilt |
| Superheatertype: | Schmidt (as rebuilt) |
| Cylindercount: | Two, inside |
| Cylindersize: | New: 21x [{{convert|20|x|26|in|0|abbr=on}}] Rebuilt: 20.75x |
| Valvegear: | Stephenson |
| Tractiveeffort: | 25000lbf [{{convert|22700|lbf|kN|abbr=on}}] when built, 21300lbf as rebuilt |
| Operatorclass: | CR: 49 and 903 classes |
| Powerclass: | LMS: 4P |
| Disposition: | All scrapped |
The Caledonian Railway 49 Class and 903 Class were 4-6-0 express passenger locomotives designed by John F. McIntosh and built at the Caledonian Railway's own St. Rollox Works in 1903 and 1906 respectively.
In 1903, the Caledonian Railway had no passenger locomotives larger than 4-4-0s, and the heaviest trains over its main line between Glasgow and Carlisle required to be double headed, even in the less demanding southbound ('up') direction. Northbound ('down') trains also required banking assistance on the climb to Beattock Summit. In an effort to avoid these requirements, McIntosh designed a large 4-6-0 based on his 'Dunalastair' series of 4-4-0s. Two locomotives were built in 1903, and immediately became the Caledonian's flagship locomotives. Nonetheless, their performance did not live up to expectations, and it was soon clear that banking assistance was still required over Beattock. Until 1906 the Caledonian railway had no turntables long enough for the 49 Class, and arrangements for turning them included use of the Cathcart Circle or turning locomotive and tender separately.
By 1906, experience with the 49 Class had enabled McIntosh to design an improved version, and the installation of new turntables at major engine sheds presaged the arrival of five new locomotives. The first of these, number 903, was named "Cardean" after the country estate of one of the CR directors, and immediately became the company's new flagship locomotive, with its name becoming a nickname for the whole class. The Caledonian gave the new locomotives a great deal of publicity and "Cardean" thus achieved some fame. Even so, the performance of the 903s was still unremarkable.
Neither class was equipped with superheating when built, but all seven locomotives were rebuilt with Schmidt superheaters and new cylinders during 1911. These modifications reduced coal consumption but made little difference to the locomotives' performance, and McIntosh built no more large passenger 4-6-0s (although he did build smaller 4-6-0s for goods traffic). His successor William Pickersgill had no greater success with his sluggish outside-cylindered 60 Class or the disastrous three-cylinder 956 Class, so the Caledonian Railway continued to rely heavily upon 4-4-0s for express passenger traffic until the Grouping.
One 903 class locomotive was withdrawn in 1915 due to accident damage, but the other six locomotives passed to the London, Midland and Scottish Railway in 1923. The two 49 class locomotives were extensively renewed around 1924 with new frames and cylinders, but all of the Caledonian passenger 4-6-0s were quickly eclipsed by new LMS Compound 4-4-0 and Royal Scot 4-6-0s. The four surviving 903s were withdrawn in 1927–30, whilst the two 49s lasted until 1933. All were scrapped.
See main article: Quintinshill rail disaster.
| 49 | 14750 | St. Rollox | 49 Class | ||||
| 50 | Sir James Thompson | 14751 | St. Rollox | 49 Class | Last to be withdrawn | ||
| 903 | Cardean | 14752 | St. Rollox | 903 Class | |||
| 904 | 14753 | St. Rollox | 903 Class | ||||
| 905 | 14754 | St. Rollox | 903 Class | First to be withdrawn | |||
| 906 | 14755 | St. Rollox | 903 Class | ||||
| 907 | St. Rollox | 903 Class | Accident write-off | ||||