Every battery locomotive that replaces a diesel will reduce carbon dioxide emissions by 3,000 tons per year, Wabtec estimates. But it is unlikely they can quickly replace diesel-powered trains.
People Also Ask
The decision not to procure new diesel trains had already been made in 2020. As soon as trains have reached the end of their economic life, they are now to be replaced with battery trains. Trains that are theoretically still operational are to be used on non-electrified lines during the transition.
Today's rail networks largely consist of electric trains 'tethered' to electric overhead and live rail systems. However, this is not feasible everywhere due to the high infrastructure cost/mile, remote geographic locations, and the practicality of building through tunnels and bridges.
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.
Diesel locomotive engines are a major contributor to air pollution. The culprits are NOx SO2. Both are readily produced by diesel locomotives and both cause an array of health and environmental problems.
The diesel-electric locomotive has a thermal efficiency (percent of useful work derived from a unit of fuel) of 20–25%. Since a gallon of fuel oil contains approximately 130,000 Btu of energy, only 20–25% of this would be available to produce work, that is, pull the train.
Power plant capacity is far greater than any individual locomotive uses, so electric locomotives can have a higher power output than diesel locomotives and they can produce even higher short-term surge power for fast acceleration. Electric locomotives are ideal for commuter rail service with frequent stops.
Electric Trains vs.Diesel-powered trains transfer about 30-35 percent of the energy generated by combustion to the wheels, while supplying electricity directly from an overhead powerline transfers about 95 percent of the energy to the wheels.
Usually 30 to 50 years but a diesel engine might be replaced by a more modern and efficient model after half that time. Likewise a locomotive's electronics can be upgraded, or adjustments to new signalling systems made.
Disadvantages of electric traction include: high capital costs that may be uneconomic on lightly trafficked routes, a relative lack of flexibility (since electric trains need third rails or overhead wires), and a vulnerability to power interruptions.
Are trains becoming obsolete? No. Trains continue to be the cheapest form of long distance land transportation for freight there is. Ships and barges can carry more cargo for less, but they cannot transit the large land masses and certainly not as fast.