The inquiry recommended the introduction of the Automatic Train Protection (ATP) system, although it is not certain this would have prevented the accident (ATP guards against driver error, not installation error). Following the Clapham Junction accident and two other fatal accidents in early 1989, British Rail was keen to implement the ATP system across the entire British railway network. However, the then Conservative government, which was preparing the company for privatisation, baulked at the cost (estimated at over £1bn). In the end, two different proprietary systems were trialled, TBL on the Great Western Main Line and SELCAB on the Chiltern Main Line, but neither system was rolled out across the network. Today, all Great Western Railway HSTs are fitted with ATP and are not permitted to carry passengers unless the system is functioning.