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D426 entered service in July 1968 and was later renumbered 50026 under TOPS renumbering. In March 1978, 50026 was named Indomitable after the Royal Navy's modified Illustrious-class aircraft carrierwhich was scrapped in 1955.

50026 was 50026’s survival is somewhat remarkable as the locomotive is the only one of several locomotives sent the Class 50s surviving today that managed to escape from the scrapyard. It languished in the yard of C F Booth's scrap yard in Rotherham , one of several locomotives sent there in 1992. These locomotives were part of an ultimately unsuccessful bid project by 'Operation Collingwood'. The current owners owner, Paul Spracklen, purchased 50026 the locomotive together with missing parts salvaged from the other project locomotives that were missing from 50026went for scrap.<ref>[https://en.wikipedia.org/wiki/British_Rail_Class_50#Preservation Operation Collingwood in Wikipedia] (Retrieved 30 September 2018}</ref>

​Initially, 50026 was moved by rail from Rotherham to the Mid Hants Railway (1993), MOD before the owner sought a new home where much of the restoration was carried out undercover at the MoD base at Bicester in Oxfordshire (1993). A thorough restoration project spanning two decades transformed the loco into ex-works, large logo condition. After Bicester, further work was carried out at Old Oak Common depot common (2007) , the workshops of RVEL in Derby and EastleighWorks. A return to traffic came at the Swanage Railway on May 11, where it currently resides2012. At Old Oak Common it was startedThe loco wears the revised Network South East dark blue livery and sports navy-blue nameplates in a nod to long-up departed classmate 50032 Courageous, the only 50 to be so treated. A return to mainline operation is planned, potentially for the first time in over 18 years2019.

It carries Network South East livery. ===50026 Indomitable in preservation at the SVR===

*On 24 January 2018 50026 Indomitable it arrived for commercial repairs in the [[Diesel Depot]]. *It is intended to attend was advertised for the Class 50 Golden Jubilee on 4 - 6 October 2018but issues with the power unit the previous weekend meant it was unable to take part, the loco instead being on static display.