I was on the 10:00 from Penzance and we were the first train allowed through after both lines re-opened. As far as Taunton the plan was we would be diverted via Melksham but shortly after 14:00 the line was handed back and we went booked route.
Apparently a tamper broke down overnight and another one had to be brought from Cardiff to finish the job off before one line could be re-opened at Kintbury. In the meantime single line working was put in with some trains being diverted to reduce the flow of traffic. Apparently it was quite involved because it needed not only a pilotman to accompany each train but staff at two level crossings as they are not equipped to deal with trains "coming the wrong way".
A track tamper failed early this morning. Down line was able to operate normally, but the up line was blocked until a replacement tamper arrived (approx 1000) to complete the tamping job. This was done by about 1315 and Network Rail reopened the line to traffic at around 1415.
There were some diversions of up services as well as 'wrong-line' working with pilotmen.
EDIT: I see bobm just beat me with similar explanation!
Oh sounds like someone slipped up on their risk analyst, track plant failure is classed as a high risk which forces the project team to ensure they have a plan B if not a plan C. Project I was involved in this weekend had a plan B to kango tamp and or apply an
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