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I was too rough to cycle a few weeks back due to shingles, and took the train. Terrible kerfuffle. You have to walk to the station, filter through to the correct platform, wait for the right train, endure the stink of the unwashed masses and invasion of personal space, then reverse the experience whilst battling pass people getting on the train as soon as it's stopped. Apparently I paid for the privilege too, what a scam. Don't recommend.
Have you considered taking the bus for a week or two? Nothing will make you miss cycling more.