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.
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A locomotive fuel tank quantity(size) varies with the locomotive and whether it is a diesel or steam locomotive. Small diesel locos can be around 50 gallons for the tank. Large 4000 to 6000 HP mainline freight locos will usually have a 4000 to 5000 gallon fuel tank under the frame between the power trucks.
Today's train locomotives are already quite fuel efficient, especially compared to trucks. In fact, trains can haul one ton of goods an average of more than 480 miles on just a single gallon of fuel, making them 3-4 times more fuel efficient than trucks.
1000 miles between refuellings would not be unreasonable for a road locomotive with a 4000 gallon tank averaging 40 mph on a line with a maximum grade of 1%. However I would want refuel before I am running on the bottom third of the tank, so perhaps 700 miles is more realistic.
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.
The average fuel consumed per kilo- meter for all passenger and cargo trains is 7.97 L/ km. This value for local, trafficking, railway track laying and maneuvering trains is 7.92 L/km.
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.
Even when switchyard locomotives are not moving trains, their diesel engines are usually kept running. This is done to charge batteries, warm engine fluids and meet other operational needs. This can amount to several thousand hours of idling per locomotive each year.
Chemical holding tanks (retention tanks) are usually included on newer carriages and railcars in wealthier and more densely populated parts of the world. One issue is that the tanks need to be regularly emptied, often at a terminal station or prolonged stop-over.
Are trains more efficient than cars and planes? If you mean energy efficient, yes, trains are far more energy efficient than cars (because they carry so much more people and freight) and planes (who spend so much energy to get 30K feet into the air.)
Thus, while drivers may have fewer hours for sleep in between successive work periods, they are likely to sleep more often in a single day and to be awake for correspondingly shorter periods. Relay van workers must also sleep in noisy crew-van carriages that shudder and vibrate along with the movement of the train.
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.