I vividly remember one in the 70s from Derby to Hove which turned out to be an epic journey.
Eth 47 plus the usual rake of Mk1s. I went on it thinking it'd be a blast up the MML to Brent and then a crompton round the WLL and down the Brighton line. Wrong! 47 all the way via Tamworth, Solihull, Reading W curve, Eastleigh, Cosham and Barnham. Took an eternity especially on the SR. The way back via the same route was even worse. Progress was quite slow and it was obvious that the 47 was in trouble. It finally expired at Banbury about 2am in the morning. Another 47 was eventually found and we got back to Derby about 6am. I didn't go on any more after that!