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I completely agree with your railway comment.
Having spent some time in Austria and Germany and having experienced what it's like to travel on a NICE rail system that is always ontime, I can't say that there is a more comfortable way to travel. Not only that, it's the most efficient mass transit system that we have, depending on the engine type. An Electric or magnet train would far and away be the most efficient means of transportation.
I gave every vehicle the benefit of the doubt and loaded them down with as many passengers as they could hold.
In doing so, cars came out around 128 PPMPG. Bikes, on average, came out closer to 110 PPMPG. The GZ, is slightly better, capable of 140 PPMPG, but this isn't a very popular bike.
Air travel averages somewhere around 70 PPMPG in a Boeing 747.
For comparison, consider that bus travel is about 600 PPMPG, bicycling 638 PPMPG (@160lbs) and walking 366 PPMPG (@ 160lbs)
Cycling and walking of course are limited to single passengers, but this is how efficient those systems are.
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