5 The costs impact is approximately £60 million - traffic revenue losses of £22 million, £8 million in refunds/compensation, £12 million for replacement buses, £14 million for initial fleet modifications, and £4 million in other costs. Costs of longer term fleet modifications are still subject to commercial discussions.
6 The Central Line was closed for 11 weeks and the Waterloo and City Line for 3 weeks while investigators sought to find the cause of the accident and implement an interim engineering solution. In the wake of the derailment, Infraco BCV developed a technical solution and submitted it to LUL in late March 2004 as a basis for discussions. The closure also led to considerable overcrowding on other lines and in several stations such as Kings Cross.
7 A limited service began on 14 March and services were resumed to all stations on the Central Line by 12 April. At this stage, the cause of the motor detachment was uncertain. Infraco BCV engineers redesigned and fitted new bolts and safety brackets to the motors on its 85-strong fleet of trains. This work also included checks on all components attached to the motors including the gear box, although at this time the underlying gearbox problem had not been found. Due to uncertainty about line reopening dates, test trains running on the line, and the lengthy lead time for major works, Infraco BCV was not able to reschedule the major works on the line to take advantage of the closure.
8 LUL arranged passenger bus services to link stations with alternative rail services. While 85 per cent of Central Line passengers were aware of the replacement bus service only approximately 33 per cent used them. Satisfaction with the service was low (46 per cent) but LUL say that it was unlikely to be high because buses are usually slower than the Tube.