Why do Amtrak trains have two engines?

Anyway, the reason for using two locomotives is pretty simple. Twice the number of locomotives means twice the power. This extra power boost is used for especially heavy loads or for trains going up steep grades. A really steep grade could require as many as eight locomotives.



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For as long as there have been railroads, locomotive changes have been essential to the officials of the railroads, so that a locomotive could be exchanged for the rest of the trip to the next locomotive changing facility or the destination of the train.

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In railroad terminology, double heading indicates the use of two locomotives at the front of a train, each operated individually by its own crew. The practice of triple-heading involves the use of three locomotives. The practice of multi-heading involves the use of multiple locomotives and so on.

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Once the train is rolling, an engine with 110,000 lb tractive effort should be able to maintain 11-12 mph with at least 200 cars-- maybe 300 or more.

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Engines may be left idling to maintain important safety related functions such as maintaining engine temperature, air pressure for the brake system, the integrity of the starting systems, the electrical system and providing heating or cooling to a train's crew and/or passengers.

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As wireless technologies advanced in the 1960s, freight railroads began adding extra locomotives to the rear of trains to give them enough power to climb steep hills. This is how distributed power was born.

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Trains cannot collide with each other if they are not permitted to occupy the same section of track at the same time, so railway lines are divided into sections known as blocks. In normal circumstances, only one train is permitted in each block at a time. This principle forms the basis of most railway safety systems.

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Their speed, however, will be limited by the complexities of the 457-mile route, which is old, curvy and carries a mix of freight, commuter and intercity trains. Most Amtrak trains travel between 110 mph to 145 mph in the corridor, depending on the track and proximity to stations.

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It is part of Siemens Mobility's larger U.S. manufacturing network, with eight facilities, more than 4,000 employees and 2,000 American suppliers. Siemens Mobility has a robust U.S. supply chain to support locomotive production, including Cummins, which manufactures the Tier-4 complaint diesel engines in Seymour, Ind.

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Trains consume less energy and produce less harmful pollutants than either car or air travel. Hopping on an Amtrak train will save you gas and daily wear and tear on your car. It also reduces the ever-increasing traffic congestion on the roads and in the skies.

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There are many reasons for this. There is limited service between cities (Amtrak says it runs 300 trains with about 87,000 passengers per day), freight is often prioritized over passenger service in the U.S., and trains and facilities are often outdated.

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In railroad terminology, double heading indicates the use of two locomotives at the front of a train, each operated individually by its own crew.

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The 4-6-2 locomotive became almost globally known as a Pacific type after a New Zealand locomotive that was shipped across the Pacific Ocean.

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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.

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Traditionally, railroads have kept their locomotives running continuously whenever temperatures dip below 40 degrees because the engines can become extremely difficult to restart. Trains also idle when crews change shifts. “Because of past practice and housekeeping issues, they tend to run all the time,” Downing said.

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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.

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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.

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The railways use a train detection systems which can tell signallers exactly where every train is and how fast they are going. There are also systems that can automatically stop trains if the driver doesn't take the correct course of action or passes through a red signal.

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