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A brief description of the 5101 Class is included in 5164
|power = 24,300 lb
|pressure = 200 lb/sq in}}
'''4150''' is a GWR 5101 class 2-6-2T locomotive, commonly referred to as a 'Large Prairie'. It is the only SVR-based locomotive not to have steamed in preservation. Large prairie tanks were a common sight on the GWR, with more than 300 built between 1903 and 1949 to the same basic design. The locomotives were designed to haul semi-fast and suburban passenger services to tight schedules, and were also used on medium distance freight services. A number brief description of the class were allocated to [[Kidderminster]] and [[Shrewsbury]] sheds and were regularly used on the Severn Valley Railway in its declining years. Classmate 4175 was involved in the [[Level crossing at Hill Farm, Northwood Lane#Accidents in the BR Era|fatal accident at Northwood Lane level crossing]] in August 1964. The 5101 Class was an updated version by CB Collett of Churchward's 1903 3100/5100 Class. Fellow class member is included in [[GWR Large Prairie 5164]] is an early 1930 example, while 4150 is a later post-War example. The 41xx number arose from the GWR practice, where more than 100 locomotives of one class were built, of maintaining the second number in the series and re-using older sequences of numbers where necessary. The prevalence of the Large Prairie also resulted in examples numbered 61xx, 31xx and 81xx.<ref>[http://www.greatwestern.org.uk/m_in_262.htm Great Western Archive]</ref>
==4150 in service==
By January 2018 the boiler and firebox cladding had been completed and then dismantled. The boiler had passed an ultrasonic test on the thickness of the plates and passed a non-destructive test for cracks. Work had commenced on drilling out firebox steel stays and grinding off rivet heads holding the foundation ring before the boiler headed north.<ref>Howard A, 4150 Fund Facebook, 20 January 2018</ref><ref>[http://www.4150.org.uk/news/4150_jan18.html The 4150 Fund - Restoration update January 2018]</ref>
The boiler was moved from Bewdley to Bridgnorth on 18 June 2018. {{As of|2021}} it is for work to be carried out in the boiler shop where work is approaching completion. On 29 December 2022 it was temporarily lifted into the locomotive's frames to enable all the large copper pipes to be made up and fittings test-fitted. It will need to be removed again at a later date to carry out hydraulic and steam testing<ref>4150 Fund shareholder update, January 2023</ref>.
=== Gallery ===
