[Transfinity]

Source: https://www.ucsusa.org/clean-vehicles/getting-there-greener

Turns out motor coaches (e.g. Greyhound busses) are the most efficient at pretty much any distance.

[morsch]

Their number for travel by rail: 0.37 - 0.43 pound of CO2 emissions per passenger-mile.

Germany's department of environment number for travel by rail: 38 gram/kilometer = 0.13 pound per passenger mile.

(Source (German): https://www.vcd.org/fileadmin/_processed_/8/9/csm_Emissionen...)

[lutorm]

Yeah, electrified rail is by far the most energy-efficient way of transportation. How that translates to CO2 emission of course depends on how the electricity is made.