AN RAIB investigation into a Caledonian Sleeper'Lowlander' sleeper service that failed to stop at Edinburgh Waverley on August 1 last year has determined the brake pipe isolating cock between the locomotive and the leading coach was closed. The investigation says the cock became closed during coupling operations when the Edinburgh train was split from the Glasgow portion at Carstairs station. This happened after the mandated brake continuity test had been completed.
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