a derailed freight hauled by D1671 Thor near Bridgend, South Wales. The driver and second man of D1671 died, and damage to both locomotives was extensive enough that even though each locomotive was barely a year old, they were withdrawn and eventually scrapped. D6983 was the first Class 37 withdrawn and the only one of the class not to be renumbered. In January 1988, locomotives No. 37671 and 37672 were hauling a freight train that was diverted into a siding at Tavistock Junction, Devon due to a pointsman's error. The train collided with a wagon, pushed it through the buffers and was derailed. Some locomotives suffered nose-end damage through minor collisions. As a result, a number of Class 37/0 variants were rebuilt with the split-headcode boxes that were a feature of the series 1 build replaced by series 2 style central headcode panels. On 12 May 2014, locomotive 37198, stored by Network Rail on the Great Central Railway and coupled to a Post Office Sorting Van, ran away for 1.8 miles (2.9 km) due to an ineffectively placed wheel scotch. It then struck the end vehicle of a rake of five Mark 1 coaches. Departmental Network Rail ERTMS project Network Rail restored four Class 37s as part of the European Rail Traffic Management System (ERTMS) trial project on the Cambrian Line. The site of the restoration was the Barrow Hill Roundhouse, where ex-HNRC locomotives 37100, 37170, 37178 and 37217 were taken in. The restored Class 37s for ERTMS use were re-designated as Class 97/3, numbered 97301, 97302, 97303 and 97304. The class was chosen because of its original fitment with both air and vacuum braking, a feature which will allow them to pull both modern freight trains as well as special enthusiast trains. The main work of the locomotives is to pull on-track machines (such as tampers) through the ERTMS section. The 97/3s are based at the newly constructed Coleham Depot for the duration of the ERTMS testing on the Cambrian Line, thereafter they are used to pilot trains not fitted with the ERTMS signalling system. They are also used to work Network Rail test trains on other parts of the network when not required for ERTMS testing. These locos were effectively refurbished, having been completely stripped down to bare steel, with reconditioned engines, somewhat updated cabs, all new signalling systems installed (ERTMS in this instance) and extensive re-wiring. 97302,