Add an hour commute to the airport, another hour at check-in and security and 10x the emissions: it's actually a fun experience going by night train, especially when traveling with kids.
An electrified train running on nuclear or wind supplied power basically can’t be beat for low-environmental-impact long distance travel. And even for non-electric trains, diesel trains with a mere 23 people per car have a BTU per passenger mile of 2,000, compared to a typical 30mpg car’s 4,000 BTU per mile.
And even if it’s not yet electric, buying the right of way and building the rail lines is better preparation for that future all-electric world. Plus the more trains exist, the more full they’ll typically be, and the better we’ll get at making them more efficient.