Idling switchers use between 3 and Il gallons of fuel per hour depending on the ambient temperature. If a switcher idles 12 hours a day in warm weather and burns 3 gallons of fuel per hour, it would consume 36 gallons of fuel per day.
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Railroads are roughly four times more fuel efficient than trucks. Shipping freight via rail limits greenhouse gas emissions and increases fuel efficiency, reducing the transportation carbon footprint. In fact, moving freight by rail instead of truck lowers greenhouse gas emissions by 75%.
Loading of coal and water and incidental maintenance takes a steam locomotive about 1 hour. A diesel engine can be fueled from a pump in 10 minutes or so.
For a fuel cost of $0.84 per liter of diesel ($3.17 per gallon) (AAR (2012b)), this results in an average running fuel cost of $185 per locomotive-hour. If actual train and operation data are available, energy models or rail simulators may provide more accurate fuel use values for specific conditions.
Freight and passenger rail rely almost exclusively on diesel power. The latest diesel innovations contribute to cleaner air and reaching climate goals.
These can be as low as 200 revolutions per minute (RPM), in contrast to earlier locomotives which typically idled at 315 RPM. Many of the earlier units have been retrofitted with available low idle speed modifications to reduce idle RPM as much as possible, limiting noise and air emissions.
For a fuel cost of $0.84 per liter of diesel ($3.17 per gallon) (AAR (2012b)), this results in an average running fuel cost of $185 per locomotive-hour.
If price is the deciding factor, the car trip will usually be the cheaper one for anything more than a single passenger or a single passenger with infant child in tow. (Kids under two generally ride the train free.)
A train engine requires about a hundred litres of fuel to get it started. So it wouldn't be economical if the engine is stopped and started frequently. This apart, if the engine is stopped, the moving parts' lubrication will also come to a halt.
Fuel Tank. This huge tank in the underbelly of the locomotive holds up to 5,500 gallons (20,820 liters) of diesel fuel, plus an additional 300 gallons (1,135 liters) of coolant, and 250 gallons (946 liters) of engine oil.
Greenhouse gas (GHG) emissions are directly related to fuel consumption. According to EPA data, freight railroads account for just 0.5% of total U.S. GHG emissions and just 1.7% of transportation-related GHG emissions. Moving freight by rail instead of truck lowers GHG emissions by up to 75%, on average.