In the 1930s, the system was adapted for streamliners, the fastest trains of their day. Diesel–electric powerplants became popular because they greatly simplified the way motive power was transmitted to the wheels and because they were both more efficient and had greatly reduced maintenance requirements.
Why do train locomotives use electric motors?
Each traction motor (C) is directly geared to a pair of driving wheels. The use of electricity as the “transmission” for the locomotive is far more reliable than using a mechanical transmission and clutch. Starting a heavy train from a dead stop would burn out a clutch in a brief time.
Are train engines diesel-electric?
Although commonly called “diesels,” the locomotives actually are electrically driven. The diesel engine drives an alternator, which produces electricity to run electric motors mounted on the locomotive’s axles.
Why are ships diesel-electric?
The power plants are located in two separate engine rooms. A BP Shipping statement explained: “Diesel-electric propulsion was chosen because it significantly increases reliability and reduces air emissions and maintenance downtime.”
What are the advantages of diesel-electric?
They include a more efficient propulsion system, less pollution, increased operational efficiency, especially at slow speeds (important for applications such as dynamic positioning), and flexibility in locating machinery compartments.
Why train engines are not turned off?
Trains, being large and heavy, need the optimal brake line pressure for its efficient stopping. For obvious reasons, loco pilots never compromise on brake line pressure. Another reason for not turning off diesel train engines, lies in the engine itself. … A train’s diesel engine is a large unit, with around 16 cylinders.
Why do trains have engines on both ends?
If the locomotive pulls the whole train on an up slope, the joint on the head end has to take all the load. This makes the joint vulnerable to drawbar & knuckle pin failures. The attachment of rear engine reduces the chances of failure since it pushes the whole train and reduces the stress.
Why do steam trains have diesels on the back?
Shunting at the destination/terminus – not all destinations have run round loops in the platforms to allow the loco to change ends. Having a diesel loco at the back allows the stock to be pulled clear and release the train engine, which can then go off for turning (either via a wye/triangle or a turntable).
How much horsepower does a diesel train engine have?
How many horsepower is a diesel locomotive? A locomotive’s diesel engine is connected to an electric generator that is either DC or AC. In either case, the power produced is around 3,200 horsepower. The generator uses this power to convert it into a massive amount of current, approximately 4,700 amperes.
What powers do freight trains have?
A few passenger rail lines have been converted to electric power in the United States (Amtrak’s Northeast corridor and Harrisburg, PA, line), but the rest of passenger rail and all of freight rail is diesel-powered.
Why do diesels last longer?
Diesel engines do last longer than petrol ones. Diesel is a light oil and when burned and used as fuel by the vehicle it lubricates the parts of the engine. This prolongs the life of the engine. Petrol is a detergent and washes away oil from the components of the engine, therefore, wearing it out quicker.
Are there still diesel submarines?
There is still no such thing as an operational 30-knot diesel submarine — on primary propulsion or batteries. Running at maximum speed submerged depletes the battery at an exponentially higher rate than the far more efficient five knots or less.
Why are there no diesel-electric trucks?
Because it: Costs a lot more for such a powertrain (engine+generator+VFD+motor – vs – engine+transmission), It weighs approximately 2x, and. The fuel efficiency while cruising is lower by the efficiencies of the generator, VFD and motor multiplied (about 98% * 97.5% * 98% = 93.6%), so there is no payback.
Why don’t we have diesel-electric cars?
Without electric motors, it is necessary to connect the diesel engines directly to the drive wheels, and except in small locomotives this limits the capacity since transmissions are limited in the amount of power you can put through them. Diesel electric locomotives don’t need to use transmissions.
Are diesel-electric engines efficient?
The diesel-electric system offers flexibility of fuel and as will be shown, could be driven coast-to-coast, nonstop, with an efficiency of around 75 miles per gallon.
How much diesel does it take to start a train engine?
Much depends on the size of the composition, because it varies according to the weight of cargo being added to the total weight of the composition (train) and the type of engine power and speed and he travels and the type of slope of the rail line can reach 50 liters of diesel per kilometer, or hours worked, because …