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This. I used to commute bristol > bath and i hated the drive. Cycling is about 13 miles each way but i worked out i only had to do it a couple of times a week to make it cheaper (including cost of bike, extra crisps mid-morning etc) than driving all week. I ended up cycling most days in the end, but it was nice to know if i chickened out for a few rainy days, i was still saving dosh.
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Bristol > Bath is my dream commute because of this http://www.bristolbathrailwaypath.org.uk/home.shtml
You can really put the hammer down for long stretches.
Was that open when you were doing the commute?
My commute is only 14 miles each way so I'm not qualified to comment on the distance. I would say though that it's worth working out public transport costs and a train vs bike break-even point. I did this ages ago and I think I worked out I only needed to cycle one or two days a week (Oystering on the train the other days) for my total travel bill to be lower than a monthly travelcard. It helped frame my ride in a more positive way for me - Slogging through the rain for an hour and a half is a lot more bearable if you don't feel you're stuck doing it every day to justify your original decision.