| Midland Railway 1252 class | |
|---|---|
| Power type | Steam |
| Designer | Samuel W. Johnson |
| Build date | 1875–1876 |
| Total produced | 30 |
| Configuration | 0-4-4T |
| UIC classification | B2′ n2t |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Driver diameter | 5 ft 6 1⁄2 in (1,689 mm) |
| Locomotive weight | 53 tons 4 cwt (119,200 lb or 54.1 t) |
| Boiler pressure | 140 lbf/in² (0.97 MPa) |
| Cylinder size | 17 × 24 in (432 × 610 mm) |
| Valve gear | Stephenson |
| Tractive effort | 13,810 pounds-force (61.43 kN)abbr=on |
| factorofadhesion = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | railroad = MR » LMS » BR | railroadclass = | powerclass = 1P | numinclass = | roadnumber = | officialname = | nicknames = | axleloadclass = | locale = | deliverydate = | firstrundate = | lastrundate = | retiredate = | withdrawndate = | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = }} The Midland Railway 1252 Class was a class of 30 0-4-4T locomotives built by Neilson & Co. in 1875-1876 to the design of Samuel W. Johnson. They were a development of the 6 Class. Originally numbers 1262-81 and 1252-61. Under the 1907 renumbering scheme they became 1236-65.
For this class, the Midland used nominal 5-foot-6 1⁄2-inch (1,689 mm) diameter driving wheels, whereas in all later engines (starting with the 1532 Class) they used nominal 5-foot-3-inch (1,600 mm) diameter wheels. They were given the power classification 1P.
Nine, Nos 1239/46/7/9/51/2/5/60/1 were still in LMS stock at the end of 1947 and passed to British Railways (BR). BR allocated them numbers in the 58xxx series, though not all were renumbered before withdrawal. The class was extinct in 1954. None was preserved.