[dwg]

Yep, it often makes more sense to go by car (especially when you can fill your car up), or you want to use your car at the destination (though renting is an option here).

Sometimes going by train is just more pleasant. Kids don't need to be strapped into carseats, repeatedly asking "are we there yet?" You can go to the bathroom or stretch your legs any time. You can do other things, such as enjoy the scenery or read a book. Also, last time I checked, trains are lot safer than cars. There is no traffic. Finally, you don't have to drive!

If you like, you might consider soft factors in addition to the fare :)