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Going to say before it gets into a big debate, its driver discretion who rides in the cab with them. I've refused managers before as they had no cab pass. Back to OP he was in the wrong.
A phone call to the duty manager confirmed that we are not authorised to pick up other companies train crew. The fact that he wanted a lift when there was a passenger train 15 minutes later doesn't wash with me.
I work for a FOC, I've been stopped before a station by a signaller, phone conversation was can u pick a driver up at the next station, I asked what he had worked in, another companies train. Said no as we r not insured to carry other companies train crew especially if something went wrong.