First, consider the last time you were on a passenger train. Add up the weight of all the folks in your car. Do you think they weighed more or less than the car itself? Unless you were packed into a subway train with Japanese sumo wrestlers, the answer is that the weight of the car dwarfs that of the passengers it is carrying. The average Amtrak passenger car apparently weighs about 65 tons (my guess is a high speed rail car weighs more). The capacity of a coach is 70-80 passengers, which at an average adult weight of 140 pounds yields a maximum passenger weight per car of 5.6 tons. This means that just 8% of the fuel in a passenger train is being used to move people — the rest goes into moving the train itself.
Now consider a freight train. The typical car weighs 25-30 tons empty and can carry between 70 and 120 tons of cargo. This means that 70-80% of the fuel in a freight train is being used to move the cargo.
Now you have to take me on faith on one statement — it is really hard, in fact close to impossible, to optimize a rail system for both passengers and freight. In the extreme of high speed rail, passenger trains required separate dedicated tracks. Most rail systems, even when they serve both sorts of traffic, generally prioritize one or the other. So, if you wanted to save energy and had to pick, which would you choose — focusing on freight or focusing on passengers? Oh and by the way, if you want to make it more personal, throw in a consideration of which you would rather have next to you on crowded roads, another car or another freight truck?
This is why the supposedly-green folks’ denigrating of US rail is so crazy to me. The US rails system makes at least as much sense as the European system, even before you consider that it was mostly privately funded and runs without the subsidies that are necessary to keep European rail running. Yes, as an American tourist travelling in Europe, the European rails system is great. Agreed. I use it every time I go there. I have to assume that this elite tourist experience must be part of why folks ignore the basic science here.
Warren Meyer, “A Reminder: Why the US Rail System Is At Least as Good As the European System if You Care About Energy Use”, Coyote Blog, 2018-05-25.
February 28, 2022
QotD: Passengers versus freight in railway efficiency terms
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