A totally unscientific comparison, prompted by Tim O’Reilly’s tweet.
A Subaru weighs 1.33 tonnes.
A Train carriage weighs 37 tonnes. ref
At capacity, a Subaru can carry 4. A train carries 275.
Type
Calculation
Tonnes per person
Trains
37 tonnes / 275 person
0.134545455
Cars
1.33 / 4
0.3325