Providing these €49 tickets requires an annual subsidy of around €3bn, on top of already substantial subsidies for the rail industry. If we accept that it reduces carbon emissions by 6.7 million tonnes per year, then that works out to €447 per tonne. That really isn't good value - most carbon abatement methods cost well under $100 per tonne. I do recognise that modal shift towards rail may have other positive externa…
It gets people out of their cars because it's cheaper than petrol. When train tickets (in other countries) cost more than the cost of petrol for the journey, commuters who already sank the cost of buying a car + insurance ask why they should bother paying a premium for the train ticket when the cost of petrol will be cheaper.
Only after people transition to taking the train in the morning, do they then start to ask questions like "do I get value out of paying for insurance on a car I don't drive?" and start to make decisions like selling their cars. In this case the carbon reduction is not only the carbon reduction of the trips that would have been taken by train, but the carbon reduction from the use of the car altogether, and future car maintenance and replacement.