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On 7 March 2015, a steam-hauled charter train passed a signal at danger (SPAD) on the approach to Wootton Bassett Junction, in the English county of Wiltshire, and subsequently came to a stand across the junction. The train that the signal was protecting had already passed through the junction and no collision occurred. As a direct result of the incident Network Rail banned the train's operator, West Coast Railway Company (WCRC), from operating trains anywhere on the British railway network. The Rail Accident Investigation Branch opened an investigation into the incident, which it called a "dangerous occurrence". The incident was rated the most serious SPAD in the United Kingdom since December 2010. Following improvements made by WCRC, the ban was lifted. ==Incident== At 17:25 GMT on 7 March 2015, a charter train approached Wootton Bassett Junction, where the Great Western Main Line and South Wales Main Line diverge at Royal Wootton Bassett, Wiltshire. In the approach to signal SN43, an Automatic Warning System (AWS) magnet was present in the trackbed, warning of a temporary speed restriction ahead.〔 The normal line speed was , but a temporary restriction of was in place. This did not apply to the train as steam locomotives are restricted to a maximum of on Network Rail (NR) tracks. An automatic brake application was made on the train after it had passed over the magnet because the driver did not acknowledge the warning given within 2.7 seconds. The driver should have allowed the train to come to a halt and contacted the signalman, but he did not. He cancelled the effect of the AWS braking demand after the train's speed had been reduced from to about . This action had the effect of rendering the AWS and Train Protection & Warning System (TPWS) unable to apply the brakes. The train passed signal SN43, which was displaying a single yellow (caution) aspect. The driver acknowledged the AWS warning, but did not reduce speed.〔 Signal SN45 was displaying a red (danger) aspect. By the time the driver realised this, there was insufficient distance available to stop the train.〔 The train eventually came to a stand on the junction some past the signal. The service train that was being protected by the red signal had already passed through the junction and no collision occurred.〔 As the points had already moved for the passage of the charter train, no damage was done to the trackwork at Wooton Bassett Jn.〔 The line speed approaching the junction was for the service train. Before he was relieved from driving duties, the driver of the charter train claimed that signal SN43 had displayed a green (proceed) aspect. NR investigations showed that a single yellow (caution) aspect was displayed.〔 Following the incident, a relief driver worked the train forward to . There a new driver was supplied by West Coast Railway Company (WCRC) who drove the train to , where the train was terminated.〔 The incident was rated the most serious SPAD since December 2010, rating 25 out of 28 on Network Rail's scale. The scale is a logarithmic scale, with each increase rated twice as serious as the previous. Any SPAD rated at 20 or more leads to a mandatory investigation by the Office of Rail and Road (ORR). The December 2010 SPAD was at Uphill Junction, Somerset, on the Bristol to Exeter Line when a passenger train overran a signal by . It was ranked at 26. The month before that incident, a passenger train overran a signal at , Staffordshire. It was ranked at 25. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2015 Wootton Bassett SPAD incident」の詳細全文を読む スポンサード リンク
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