May have been a different working if 68s/88s.
If you can provide further info it may help track down the IDs, eg what time (approx.), where exactly seen at Crewe (eg station, Basford Hall, LNWR carriage sheds etc) and also what colours they were?
It would have been between 2130 and 2140, and came in on either one of the south facing bay platforms (7 or 8) or through 11. Can't say colours as they were unlit.