Friday 13th saw only four seemingly healthy units with a full set of engines working - 6, 9, 17 and 19 - consistently producing good acceleration. Lots of poor units - the worst being units 13, 20 and 101 with 104 's performance dropping off by the end of the day. In fact 104 started off in the group of stronger performers but really deteriorated by the end, seemingly going from five to three engines with a spell of four in the middle of the day.
Saturday 14th Units 6, 15, 17, 18, 19 and 23 the strongest - based on Chesterfield berth data - and other berth sections northbound!
Units 20 and 104 by far the worst, but 104 had a better run in the evening, suggesting it may have been down to three engines at the start but had one restarted and ended the day on four.
Timings between signal berths TN4889 and Y4 0043 vary from 4:02 for a quick Meridian to 4:56 for a slow one.
810's as quick as 4:11 for 810011 and two runs of 4:30 for 810013 suggesting an engine out for that unit.
Around 4:11 is the fastest time on Friday too, achieved by 810013 and a slightly slower runs of 4:13 and 4:16 for 810012