It is quite rare for a train to run out of fuel, but it can happen.
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That should not happen, but if it does, engines are sent from the nearest terminal to pull the train to where it can be refueled, assuming it is not in a place where a fuel truck could reach it.
Trains are powered either by diesel or electricity. Electric traction is currently responsible for around two-thirds of the freight and more than half the passengers on railways. But, electric traction is just 37% of Railways' overall energy efficiency costs.
Another reason why railroad transport is better than road travel is the fuel efficiency they offer compared to hiring vehicles. Railways can consume up to nine times less fuel for every ton they carry for a kilometer, making trucks fuel inefficient compared to railroad transport.
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.
Besides steam- and diesel-powered locomotives, many modern trains operate solely on electrical power. They get the electricity from a third rail, or electrical line, along the track. Transformers transfer the voltage from the lines, and the electrical current drives the motors (AC or DC) on the wheels.
In the United States, diesel-electric locomotives are usually fueled in one of three manners: at an engine terminal, at fueling terminals along busy mainlines, and by fuel trucks wherever a fuel truck can get to a locomotive at.
If we take an overall view of the transport sector, 71% of transportation related carbon emissions come from road users, whereas only 1.8% of emissions stem from rail travel. So in absolute terms, trains are responsible for a lot less emissions than cars.
Biodiesel & Renewable Fuels: Traditionally, locomotives have run on petroleum diesel fuel, but railroads are now using renewable diesel and biodiesel blends to power them.
The life expectancy of diesel-electric and electric locomotives is expected to be similar—about 25 years. Both types of motive power are subject to technological obsolescence.
As more new locomotives are being added to the fleet, the older ones are moved to other less demanding tasks, like moving railcars in a hump yard. Many locomotives can last 30–40 years, depending on the maintenance done on them. Our GG1 Lasted 41 years, but many of the steam locomotives were retired early.
The UK Government has announced that diesel-only trains will be phased out by 2040. Currently, 29% of the UK's fleet is diesel and the move has been received positively by campaigners.
Certain electric traction systems provide Regenerative brakes. The energy generated by the train is converted into electricity and return it to the power system that is available to be used by other trains, or to the utility grid in general.