No.72010 Hengist is a steam locomotive which is under construction as a "new-build" project.[1] This engine like 60163 Tornado will be of a new member of the class rather than a replica of an original engine, but unlike the A1 there had been plans by BR to build 72010 Hengist. However, due to a shortage of steel in the 1950s the order was postponed and later cancelled.
Since no original Clans survived to preservation, the 72006 Clan McKenzie engine was withdrawn in May 1966 and was rendered extinct in August of the same year when 72008 Clan MacLeod was scrapped. Since no original engines were saved The Clan Project plan to build one of the engines which would have been allocated to the southern region had it been constructed. The engine is being built to modern mainline standards as a go anywhere engine with a low maintenance design, making it ideal for use on heritage railways as well as hauling rail tours.
999 BR standards were built and 72010 will be the 1000th BR Standard engine to be built when completed.
The project is based at the premises of CTL Seal Ltd in Sheffield. All of the components for the first phase of frame assembly are on site and assembly has commenced. Components for the bogie frame are either in stock or are being manufactured, and the aim is to start bogie frame assembly in early summer. Meanwhile, the pattern for the outside cylinders is under construction.
Design
An improved design[2] was worked out by British Railways and was to form the basis of the Crewe Works Order Lot 242 for the second batch of Clans. The main changes involve:
The frame design from 71000 Duke of Gloucester, which involves 3 substantial steel castings which were combined frame stretchers and spring hangers. This change was to address frame cracking on the Britannias and Clans.
The delta trailing truck from 71000 which has coil springs instead of the leaf springs of the original Clan design.
New ashpan arrangement incorporating a number of changes including improved operating gear.
Revised pipe and rod arrangement.
Revised cab/tender connection including a fall plate and gangway doors.
