Really? So it's too expensive to get a train and then commute by cycle from station to door then?
It depends largely on where you live. In the USA, it's infeasible for most people because there's no train. The trains we do have are either grossly underutilized (and therefore grossly overpriced) or grossly overutilized (and therefore simply gross.)
You could negate just the vehicle excise duty with the cost of the bike alone, before you start talking all the other costs.
Here in the USA, we tend to pay about 8% tax or less once on our automobiles. In California, we have an emissions test bi-annually after I think the first four years of ownership, or on transfer of title to a non-family member, except in non-smog-controlled counties. Most of those are around the border of the northern end of the state, and relatively unpopulated. Then we only smog on transfer of title. The emissions test costs forty to around a hundred and twenty bucks, depending on whether you need a dyno test and whether you're getting screwed over. There is no safety inspection. Only a couple of states have them, and they are quite half-assed at best. Registration must be renewed yearly and ranges from about sixty dollars for an old beater up to maybe three hundred bucks for a pickup truck, which California claims to be a commercial vehicle whether you use it as such or not for the purpose of extracting money from your wallet. This wouldn't be so bad if they spent it on environmental impact mitigation, but they don't. They just spend it. Still, none of it is very much money, so you're not really saving much in the fees department.
Or of course, don't be so picky about your work and find something closer to home, then you don't have to re-mortgage and pay the stamp duty just to move premises.
In most of the world, there's really not a surplus of jobs right now. Suggesting that people should change their jobs so that they don't need to drive is not really very realistic. Our whole culture is designed to make them do that if they want to have things. I just saw a statistic that claimed that over sixty million American drivers would have to go into debt to make a median-cost car repair which translates to around six or eight hundred dollars. These people aren't looking to make major lifestyle changes right now. They're just trying to hold on. They can't afford economic instability.