I was on the 0900 Preston to Euston which was terminated, apparently at Rugby. Fortunately for me I had changed trains at Crewe onto delayed 1A05 ex Liverpool which had been held at Crewe from 0912 to 1036 arriving Euston 1236 , so was only 30 mins late for me. All train manager told us was problem with a LM train in Watford tunnels. Suffice to say Crewe was unusually busy at about 1030 on a Sunday with detrained people on platforms and at least 3 s/b Virgin Pendelinos being held while it was decided what to do. To be honest, not sure even the announcer at Crewe or Virgin staff really knew either. Only now since Im back home in Lancs (2000) can I find out what happened . Also we were also told that Eurostar would any honour tickets for later, even if passengers were delayed. Seems things were back to normal at lunchtime x