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===Fourth boiler ticket===
A quick overhaul was carried out allowing a return to steam by 2001. 686 resumed duties as ‘Thomas’ in 2002, again [[SVR-based locomotives visiting other events|visiting many railways in the UK and also making overseas visits to Holland (Z.L.S.M.) and Germany (Krefeld) in 2005]]. After being withdrawn from service in September 2009, once again with boiler issues, 686 was cosmetically restored at Bridgnorth into ICI red livery as 'The Lady Armaghdale'. The locomotive then entered [[The Engine House]] on 18 October to be displayed while awaiting overhaul.<ref>SVR News 171</ref> She briefly left The Engine House on a few occasions, in March 2012 to visit the NEC (Best of Britain Exhibition) and again briefly in June 2018 and March 2019 during shunts of displayed locomotives. In July 2019 she was extricated from [[The Engine House]] and transported from Bridgnorth for display at the Chateau Impney Hill Climb Motorsport event. The locomotive again left the Engine House in June 2021 in order to create space for a 'Staycation' event, 'temporarily' moving to [[Kidderminster Carriage Shed]].<ref>[https://wilt.jimdo.com/7b-0-6-0t-he686-of-1898/ WILT]</ref> In the event it continued its storage there, occasionally appearing on display, such as at Kidderminster during the 2023 [[Christmas services]], until returning to the Engine House in a shunt on 7 May 2024.
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==Cartazzi axleboxes==
F. I. Cartazzi was a senior engineer of the Great Northern Railway. His modified axlebox design was intended for trailing carrying wheels on larger locomotives and was used extensively on LNER ‘Pacific’ steam locomotives.<ref>[https://en.wikipedia.org/wiki/Cartazzi_axle Wikipedia]</ref> On 686 his system is used on the leading axle. The top of the axlebox and underside of the axlebox lid have a series of inclined faces. On sharp curves the axlebox is forced sideways, bringing different faces into contact with the lid. On leaving the curve, the weight of the locomotive transmitted through the bearing spring and axlebox lid provides a self-centering force. The leading connecting rods on 686 include an additional horizontal pivot in front of the centre driving wheel to cater for the lateral movement of the front wheel, a feature not necessary on similar locomotives with normal axleboxes such as [[LMS Jinty 47383]].
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