GWR 1400 Class

Like the 48xx/14xx, the 517 Class was a lightweight loco for branchline work; it was built at Wolverhampton railway works between 1868 and 1885. In this period evolutionary changes included: • 517-570 – with wheelbase, inside bearings to trailing wheels, and saddle tanks built 1868-1869. • 571-576 – with wheelbase, outside bearings and side tanks built 1869-1870 • 826-836, 838-849, 1154–1165, 202-05, 215-222, 1421–1432, 1433–1444, 1465-1482 – all with wheelbase with side tanks built 1873-1883 • 1483-1488 – with wheelbase and side tanks built 1884-1885 Later gradual changes included Belpaire fireboxes, boilers rated at as opposed to , full cabs, extended bunkers and the progressive conversion of short wheelbase locos to or . From 1924 onwards, several were converted to run with an autocoach, and in this configuration were the direct ancestors of the 48xx class. In this form, the updated 517s were but a small step away from the 48xx. The wheelbase was still , the boiler still rated at only , and the wheels and . New was the Collett-style cab and bunker and the boiler nominally to a new design. A three bar crosshead was added to the motion. This was a 1924 innovation introduced with the GWR 5600 Class and also seen in the 1930s-built 5400, 6400 and 7400 classes of pannier tanks. ==Into service==

in 1961 The 4800 Class was designed as a more modern version of the 517 Class, which were by then beginning to show their relative age. The first locomotive, No 4800, was built by Swindon Works and entered service in 1932, with a further seventy-four engines of this type following up to 1936. During this period, Swindon also built twenty 5800 Class engines, which were broadly similar, but which were not fitted with autotrain equipment or the Swindon top feed as later fitted to a number of 4800 class engines. The 4800 Class locomotives retained their original numbers until the GWR decided to experimentally convert twelve 2800 Class 2-8-0s for oil-firing. It was decided that the converted engines would be reclassified as the 4800 Class and so the 75 tank locomotives already carrying this designation were reclassified as the 1400 Class with running numbers 1400-1474. The engines did not revert to their original classification after the experiment ended in 1948. They could reach a maximum speed of which was much faster than the diesel railcars designed to replace them could reach. During the 1953 production of the Ealing comedy The Titfield Thunderbolt, 14xx locomotives Nos. 1401 and 1456 (doubling as 1401) were specially assigned to the film shoot, which took place primarily in the Limpley Stoke area. For this, the locomotives were temporarily allocated to Westbury locomotive depot. The 1400 Class was designed to work with the GWR design of autocoach, a specialist vehicle with driving controls designed for push-pull working and which could also be used with similarly equipped engines such as the 517 Class, and the 5400, 6400 and the older 2021 classes. This lack of auto gear was the cause of earlier scrapping of the 5800 Class as there was no work for them. The last, no. 5815, was withdrawn from Swindon shed in April 1961. The auto-fitted locos fared little better; scrapping commenced in 1956 and all were withdrawn by early 1965. Nos. 1442 and 1450 were withdrawn from Exmouth Junction shed in May 1965. By the early 1960s several had been in store (parked in an out-of-the-way siding with a tarpaulin over the chimney) for some time, being occasionally steamed to replace failed diesels. == Preservation ==

Four examples have been preserved, all late withdrawals from service in the 1963-1965 period. All went direct to preservation from British Railways in relatively good condition. Loco numbers in bold mean their current number. 1442 spent its last years working between Tiverton and Tiverton Junction and became known as Tivvy Bumper. It was purchased by Lord Amory in 1965 for display at Tiverton. All preserved examples apart from 1442 are fitted with auto train equipment, and 1450 has also operated on the mainline in preservation, but due to its size was restricted in the amount of work it could do and was also restricted on mileage, as the 1400s only have a max water capacity of . During the 1990s it worked a number of Dawlish Donkey trips from Exeter St Davids to Newton Abbot. ==Models==

• DJmodels produced models of the 14xx, 58xx and 48xx class locomotives in 00 gauge in 2018. • Dapol released a version of the 14xx in O gauge in early 2020. ==References==