Late 80s, on an all-line, I was on 1S19 (TM-Scotland sleeper) when I was woken by shunting at Crewe. Electric replaced by 47480 due to wires down ahead, a quick check of my watch revealed that we were already well down, we must have been stationary for some time. We proceeded towards Manchester instead of up the WCML. The expected diversion via Bolton did not materialise, instead after Stockport I saw Stalybridge signs through my bleary eyes. Across the pennines and on to York, where I got off. I was heading for Glasgow initially, but I got off at York, only about an hour before the train was due into Glasgow.
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Another one - mid 80s, a 9 car thumper formation arrives at TM on a Portsmouth Cardiff. Unusual enough in itself, but made even more unusual in that it did go to Cardiff instead of being turned round at TM as was the case usually.