| LMS 7F 0-8-0 | |
| Powertype: | Steam |
| Builder: | LMS Crewe Works |
| Builddate: | 1929–1932 |
| Whytetype: | 0-8-0 |
| Uicclass: | D h2G |
| Totalproduction: | 175 |
| Driverdiameter: | 4feet |
| Locoweight: | 60.75LT |
| Tenderweight: | 41.2LT |
| Locotenderweight: | 101.95LT |
| Length: | 56feet |
| Wheelbase: | Loco: 18feet |
| Fueltype: | Coal |
| Fuelcap: | 4LT |
| Watercap: | 3500impgal |
| Boiler: | LMS type G7¾S |
| Boilerpressure: | 200lbf/in2 |
| Firearea: | 23.5square feet |
| Tubesandflues: | 1434square feet later 1402square feet |
| Fireboxarea: | 150square feet |
| Superheaterarea: | 353square feet to 338square feet |
| Cylindercount: | Two |
| Cylindersize: | NaNx |
| Valvegear: | Walschaerts, piston valves |
| Tractiveeffort: | 297452NaN2 |
| Powerclass: | 7F |
| Withdrawndate: | 1949–1962 |
| Disposition: | All scrapped |
The London, Midland and Scottish Railway Fowler Class 7F was a class of 0-8-0 steam locomotives. They were a Midlandised version of the London and North Western Railway (LNWR) Class G2 and Class G2A 0-8-0s. They were also classified as Class G3 under the former LNWR system. The class were sometimes known as Baby Austins, or Austin 7s, after a motor car that was becoming popular at the time.
It featured a Belpaire firebox and increased boiler pressure over its predecessor but had the same power rating of 7F. Unfortunately the design had been done at the old Midland Railway's Derby Works and the drawing office staff insisted on using Midland practice. Among other things this meant that the axle bearings were too small for the loads they had to carry. E.S. Cox, writing in a series of articles in Trains Illustrated c. 1957, suggests that they had a sufficiently modern and effective front end that, for steady slogging, some drivers preferred them to an LMS Stanier Class 8F. However, this also meant that, with bearings comparable to an LMS Fowler Class 4F and already inadequate for the lower powered engine, the bearings broke up rapidly.
| Number | Lot Number | Date built | Crewe Works serial Nos. | ||
|---|---|---|---|---|---|
| LMS | BR | ||||
| 9500–99 | 49500–99 | 57 | 1929 | 5872–5971 | |
| 9600–02 | 49600–02 | 71 | 1930 | 6047–49 | |
| 9603–19 | 49603–19 | 71 | 1931 | 6050–66 | |
| 9620–32 | 49620–32 | 81 | 1931 | 1–13 | |
| 9633 | 49633 | 81 | 1932 | 14 | |
| 9634–35 | 49634–35 | 81 | 1931 | 15–16 | |
| 9636–59 | 49636–59 | 81 | 1932 | 17–40 | |
| 9660–74 | 49660–74 | 84 | 1932 | 41–55 | |
Numbers 9672–74 were fitted with ACFI feedwater heaters when built but these were removed during the Second World War. After the war, five were briefly converted to oil burning.
All members of the class entered British Railways ownership in 1948, but 122 had been withdrawn by the end of 1951; fifty were withdrawn without receiving their BR number. They had a fairly short life, and all were withdrawn and scrapped between 1949 and 1962, some time before the final G2s were withdrawn in 1964.
All engines were withdrawn between 1949 and 1962.
| 1949 | 175 | 61 | align=left | 9504/07/12/17–18/21–22/27–28/30/33–34/42/46/49–50/59/65/73/75–77/84/97/99, 9601/04/06/13–14/16/26/29/32–33/39/42/44–46/52/54/56/58/69–70, 49513/25–26/39/51–52/64/81/84, 49607/11/22/30/43/47. | |
| 1950 | 114 | 37 | align=left | 9514/29, 9619/21, 49500–01/16/19–20/31/35/37/41/43/53/56/61/67/69/74–75/79/83/96, 49605/09/15/28/34–36/41/49/51/53/55/65. | |
| 1951 | 77 | 24 | align=left | 49502/10/23/40/58/68/71/80/85/87/89–90/93–95, 49610/17/23/25/31/50/60/63/73. | |
| 1952 | 53 | 6 | align=left | 49506/48/63/91, 49661/71. | |
| 1953 | 47 | 4 | align=left | 49524, 49600/08/12. | |
| 1954 | 43 | 2 | align=left | 49503, 49602. | |
| 1955 | 41 | 3 | align=left | 49554/57/70. | |
| 1956 | 38 | 6 | align=left | 49532/52, 49603/20/38/66. | |
| 1957 | 32 | 12 | align=left | 49536/38/45/47/55/60/66, 49648/57/59/64/72. | |
| 1958 | 20 | 0 | align=left | — | |
| 1959 | 20 | 11 | align=left | 49509/11/15/78/82/86/92/98, 49640/62/67. | |
| 1960 | 9 | 4 | align=left | 49505/44, 49624/74. | |
| 1961 | 5 | 4 | align=left | 49618/27/37/68. | |
| 1962 | 1 | 1 | align=left | 49508. |