Changes

|status = In Out of Service

43106 was the last of a batch of 37 built by BR at the former LNER Darlington North Road Works. The locomotive entered service at South Lynn, Norfolk in April 1951 where it remained for 5 years. Along with many others of the type it was extensively used on stopping passenger and freight services and occasional express passenger trains (the "Leicesters") on the Midland & Great Northern Joint Railway. Much of this system was single track with passing loops and the locomotive carried [[Single line working using tokens|Whitaker token exchange apparatus ]] fitted into a "pocket" towards the front of the tender. The sphere of operation included Peterborough, Leicester, Melton Mowbray, Spalding, Cromer (Beach), Yarmouth (Beach), and Norwich City.<ref name=SVR12>SVR News 12</ref>

In August 1966 43106 moved to Carlisle Kingsmoor Depot.<ref name=SVR12/> During 1967 43106 became one of a number of locomotives cleaned by the "[[Master Neverers Association]]" on the occasion of a Langholm / Alston railtour.<ref>Never Again Volume 3, Never Again Publishing, ISBN 978-1-5272-2765-1, p. 12.</ref> The locomotive made several trips into Scotland including the most northerly on 25 February 1967, a railtour from Carlisle to Beattock and back during which the 43106 became the last steam locomotive to use Beattock turntable. The locomotive was also used regularly as Carlisle station pilot during 1967.<ref name=SVR12/> She was allocated to her final shed, Lostock Hall, in September 1967.<ref name=BRD>[http://www.brdatabase.info/locoqry.php?action=locodata&type=S&id=426002107&loco=43106 BRDatabase] retrieved 27 January 2015.</ref> After suffering a minor derailment at Colne in April 1968, BR considered damage to her intermediate drawgear to be too serious for economic repair and the locomotive was stored for two months until being officially withdrawn from service on 23 June 1968<ref name=SVR12/> after a relatively short working life of 17 years 2 months<ref name=BRD/>.

43106 was one of the SVR’s early locomotives, arriving ‘light engine’ direct from Lostock Hall on 2 August 1968.<ref>SVR Stock Book Ninth Edition</ref> It worked services on the official opening day in May 1970, and in [[Severn Valley Railway Timeline 1970-1979#1975 | 1975]] took part in the [[Rail 150 ]] celebrations at Shildon, travelling there in steam behind [[LMS Stanier 8F 48773 | 8233]]. It saw regular use until being taken out of traffic in July 1976 for the cross-heads to be re-metalled. The loco soon returned to duty but began to see declining amounts of use as the axle boxes and motion were showing signs of wear. During the following winter, new piston and valve rings were fitted and some firebox repairs were carried out, including the fitting of new studs. 43106 returned to traffic in late July 1977, but in March 1978 was withdrawn from traffic with leaking superheater flue tubes. <ref name=SVR58>SVR News 58</ref>

In spring 1979 the SVR accepted an invitation for 43106 and other SVR locos to attend the 1980 [[Rocket 150 ]] celebrations at Rainhill. A major overhaul followed, with the locomotive first being steamed on 1 May 1980. On 18 19 May 43106 left for Rainhill, still in black undercoat, with final painting into plain BR black livery being completed after arrival at Rainhill.<ref name=SVR58/> A number of other solo and double-headed appearances during the early 1980s followed.

Since returning to service, 43106 has been a regular on the SVR as well as appearing at gala events on other heritage railways. In [[Severn Valley Railway Timeline 2010-2019#2015 | September 2015]], 43106 appeared at the LMS themed gala at Barrow Hill, becoming the first of her class to appear at the Roundhouse in half a century. It At the end of 2019, 43106 had recorded a total of 123,553 miles in preservation on the SVR. The reported total may include mileage on the main line and on hire to other railways.<ref>SVR News 210, SVR-based Steam Locomotive Mileage 2017-2019, Duncan Ballard</ref> The locomotive is owned by the [[Ivatt Class 4 Group]]. It reached the end of its boiler 'ticket' in January 2024.