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|image = Steam Locomotive 43106 3 (4507428635)43106_20111126.jpg|caption = 43106 at KidderminsterHighley (2011)

|status = In Out of Service

'''LMS Ivatt Class 4 43106 ''' is the only surviving example of an LMS Ivatt Class 4 [[Whyte notation |2-6-0 Mogul]], and is affectionately referred to on the SVR as “The Flying Pig” (often shortened to "The Pig"). It is owned by the [[The Ivatt Class 4 Group]]locomotives were designed by H.G. Ivatt for medium freight work but were also widely used on secondary passenger services. Only three were built by the LMS before Nationalisation, with a further 159 being completed by BR who classified them as 4MT. The unusual design with raised running plates led to members of the class being referred to by nicknames such as “Doodlebug” or “Flying Pig”.

The Ivatt Class 4 locomotives were mainly designed for medium freight work but were also widely used on secondary passenger services. They were classified as 4MT by BR. The unusual design with raised running plates led to members of the class being referred to by nicknames such as “Doodlebug” or “Flying Pig”. Although an LMS design, 43106 was the last of a batch of 37 built after nationalisation 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. Whilst operating in East Anglia 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. Most The sphere of the tooling to reproduce the apparatus this locomotive carried whilst there has been madeoperation included Peterborough, Leicester, Melton Mowbray, Spalding, Cromer (Beach), Yarmouth (Beach), and Norwich City.<ref name=SVR12>SVR News 12</ref>

After Following the closure of the former Midland M& Great Northern Joint RailwayGNJR, 43106 was transferred to Woodford Halse on the former Great Central Railway for a period of six years, before spending in July 1956. There the rest of her working life at ex-LMS sheds in locomotive was mostly used on freight workings to Banbury and also on the Midlands Stratford and North WestMidland Joint line, usually to Stratford Old Town or Gloucester. Her longest allocation during this time was two years eleven months In March 1962 Woodford Halse came under London Midland control and 43106 began a series of short stints at Saltley, Wellingborough, Kettering and Trafford Park before a move to Heaton Mersey, from shed in September 1963 . There it worked trip freights in the Stockport district and passenger trains between Manchester Central to Cheadle Heath, before being stored in serviceable condition for around 9 months.<ref name=SVR12/> In August 196643106 moved to Carlisle Kingsmoor Depot. Following <ref name=SVR12/> During 1967 43106 became one of a spell number of locomotives cleaned by the "[[Master Neverers Association]]" on the occasion of just over a year at 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, she station pilot during 1967.<ref name=SVR12/> She was allocated to her final shed, Lostock Hall, in September 1967.<refname=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,<ref>Nabarro, G (1971), ''Severn Valley Steam'', p71</ref> 43106 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 in on 23 June 1968 <ref name=SVR12/> after a relatively short working life of 17 years 2 months.<ref>[http://www.brdatabase.info/locoqry.php?actionname=locodata&type=S&id=426002107&loco=43106 BRDatabase] retrieved 27 January 2015.<BRD/ref>.

43106 was one of the SVR’s early locomotives, arriving ‘light engine’ direct from Lostock Hall in 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 also attended and other SVR locos to attend the 1980 [[Rocket 150 ]] celebrations at Rainhill. A major overhaul followed, and a with the locomotive first being steamed on 1 May 1980. On 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.

43106 was used in filming the 1987 children's TV series [[Knights of God]].In that year it was nominated ‘spare engine’<ref>SVR News 84</ref> and saw relatively light use, before being withdrawn as requiring a boiler overhaul in spring 1988.<ref>SVR News 87</ref> The locomotive then spent some time stored out of use stored at Highley,<ref>SVR News 118</ref> before moving to Bridgnorth in late 1998 for the long awaited overhaul to begin.<ref>SVR News 128</ref>. This proceeded much slower than the previous overhaul, with the boiler not being lifted until 15 January 2000. 2001 saw the locomotive moved into the loco shed where work continued.<ref>SVR News 142</ref> In 2003 an [[:Category:SVR fundraising lotteries| SVRA raffle]] raised £9,224 towards the overhaul.<ref>SVR News 146</ref> The overhaul was finally completed in autumn 2009, with the locomotive returning to traffic in time for the Autumn Gala. Less than a week after returning to service, 43106 was [[Accidents|derailed]] at Hampton Loade station on 28 September 2009, suffering damage to the tender and its wheelsets. A new axle was ordered from South Africa, but to expedite her return the Strathspey Railway kindly loaned the axles from the tender of 46512 which was not in service at the time.<ref>SVR News 168</ref>

Her recent overhaul was completed in 2009. A more recent intermediate overhaul (January to July 2013) saw work carried out on the boiler which allowed a new 10 year certificate to be issued along with a completely new loco dragbox. She returned to service on 26 August 2013.

On 28 September 2009 she was 43106 has been a regular on the SVR as well as appearing at gala events on other heritage railways. In [[AccidentsSevern Valley Railway Timeline 2010-2019#2015 |derailedSeptember 2015]] , 43106 appeared at Hampton Loade stationthe LMS themed gala at Barrow Hill, becoming the first of her class to appear at the Roundhouse in half a century. 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]].

Since returning to service, 43106 has been a regular on It reached 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 end of her class to appear at the Roundhouse its boiler 'ticket' in half a centuryJanuary 2024.

*[[Steam Locomotives]]<br>*[[The Severn Valley Railway on the main line]]<br>*[[Accidents]]*[[SVR-based locomotives visiting other events]]