directly in service, but also the type 4 and 5 diesel locomotives built to replace the earlier diesels. In the 1995 "Shap trials" (30 Sept to 3 October) 71000 broke the record for the fastest northbound ascent and achieved the highest EDHP figures during the event, its average over the Shap ascent was 2300 and peak 2803. The Duchess of Hamilton (46229) generated EDHP figures of 2150 and 2343 respectively. The A4 Sir Nigel Gresley (60007) suffered from poor coal and possible leaking tubes so only made EDHP figures of 1671 (average) and 1812 (peak). In preservation, the "Duke" had held an impeccable operational record for reliability; however on 9 June 2007, the engine operated a railtour from to Carlisle returning via , where, for operational reasons, the locomotive's start position was changed to . Little over into the journey, the locomotive was stopped at with leaking tubes in the firebox and removed from the train. The engine was then withdrawn for repairs before a return to service in January 2008. As the locomotive now bears little mechanical resemblance to that which operated under British Railways, it has also been used as a test bed, incorporating several other modifications and innovations. These are intended to investigate how much further the locomotive's performance can be enhanced, therefore raising speculation surrounding the capabilities of an entire batch of Standard class 8 "Pacifics" had history been different. Models On 17 December 2012 Hornby announced that in their 2013 product range they would make 71000 Duke of Gloucester in BR Brunswick Green. This model was released in late 2013, where it received mixed reviews. A ready to run model in O scale, produced by Ace Trains, was released in Summer 2019. Built to coarse scale standards, these apply mainly to the wheels rather than the model more generally. Uniquely, the model has a representation of working Caprotti valve gear The only well documented construction of working live steam scale Duke of Gloucester models in Model Engineer magazine was by Denis Evans of Blackpool in England. Beginning in the 1966, and using original British Railways and Associated Locomotive Equipment (a subsidiary of Heenan & Froude) drawings, Denis built three Dukes each complete with fully working Caprotti valve gear, first in 7¼ inch gauge, and then 5 and 3½ inch gauges. The 7¼ inch gauge Duke won awards at the 48th Model Engineer Exhibition in 1979,