Did the AL1 electric haul your southbound train all the way to Euston or was it changed en route?
I ask this because the Euston-Crewe section of the West Coast main line was still being electrified in 1965 and may well have been closed during the night and at weekends whilst construction work took place. It's possible that your train could have been diverted from Euston and might have departed from any of the stations that you mention (including Paddington).
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