Things have moved on, there are no overnight trains these days that we could use to get home like there would have been when he was working in the railways... So if you agree to do them a favour like working the last train then they agree to get you back... Its cheaper than the fine they'd pay for cancelling, not to mention the taxi fares for the passengers, who in BR days would be just left stranded 'til the next day (as I can confirm!!)...
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