Comment by mljoe
9 years ago
According to the DOT, a train is only about 33% more energy efficient then driving.[1]
In addition a subway or bus system has to run on a schedule even when the train is mostly empty. The train and bus is always starting and stopping and causing all it's passengers increased delay to serve the needs of the few entering or leaving.
Public transport is the token ring networking of transportation. It's just inherently less efficient compared to a P2P routing system that only operates when there is a need and with the minimum number of stops (which is exactly 1).
[1]: https://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/pu...
First of all, the most recent data in the document you linked to shows Amtrak at 1,629 BTU/passenger-mile vs 3,877 BTU/passenger-mile for cars -- a 58% reduction in energy consumption, or alternately 2.4x better energy efficiency for trains over driving.
But it's also important to note that the numbers for Amtrak are averaged across the entire system -- and most Amtrak routes outside the Northeast Corridor operate way below capacity, despite it being very inefficient to do so. If you look at rail systems where this is not the case, like in Switzerland (716 BTU/passenger-mile) or Japan (534 BTU/passenger-mile), you end up with 5.4x and 7.3x improvements energy efficiency over driving, respectively.
[1] https://en.wikipedia.org/wiki/Energy_efficiency_in_transport...
This is something I've never understood — why can't those trains operate with fewer coaches, perhaps all the way down to one, in rural areas, or at off-peak times (for metros)?
On the other hand, the train runs on a schedule which can give you a pretty accurate idea of when you should leave and when you will arrive at your destination. The car might be faster sometimes, but sometimes it is slower and you can't always predict which it's going to be.