€6k/year is a crazy price for a car. For me insurance, tax, servicing and depreciation are about £1k/year. And also that's an extremely cheap train ticket. In the UK it would be 10x that easily.
Also, your car has to park somewhere presumably, which uses land, and I assume your car uses fuel (or electricity, but unlikely if your car is that cheap)
Park it on the drive. Yeah I wasn't including fuel costs because they depend on how much you drive. I'm probably about at about £500/year at most (I work from home).
When I commuted by car it would have been maybe £1k/year (£10/day but I lift shared).
Just goes on and on
One of the issues with trains is that people often severely underestimate the true total cost of car trips.
Maybe you can get it down to £1k/year by driving an old car that you’ve fully paid off (in which case you’re ignoring the amorted cost), never needs maintenance, has a low value to minimise depreciation and insurance etc., but even then 2-3x that wouldn’t be uncommon.