Can a locomotive push a train?

Locomotive at one end At low speeds, some push?pull trains are run entirely from the engine with the guard operating bell codes and brakes from the leading cab when the locomotive is pushing the train.



Yes, a locomotive can push a train just as effectively as it can pull one; this is a standard operational mode known as "Push-Pull" operation. In this setup, the locomotive is placed at the rear of the train, and the driver sits in a "Control Car" (or cab car) at the very front. The driver's inputs are sent via cables or radio signals to the locomotive at the back, which then provides the thrust. This is extremely common in commuter rail systems (like Metra in Chicago or the UK's InterCity lines) because it eliminates the need for the locomotive to "run around" to the other end of the train at a terminal station, allowing for much faster turnaround times. For very long freight trains, "Distributed Power" is used, where locomotives are placed at both the front and the rear (or middle) to help push the heavy load up steep gradients.

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It is usual to arrange matters so that the trailing locomotive supplies less power, i.e. that the locomotive at the front does more pulling than the locomotive at the rear does pushing. Having an independent locomotive, as opposed to a power car at each end, is also known in the railway world as a top and tail.

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Besides steam- and diesel-powered locomotives, many 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.

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Trains can pull so much because the smoothness of the rails and the small contact area of the wheels create a low friction environment, allowing them to overcome the static friction that would hinder trucks from pulling the same weight.

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When the loco pulls the frictional force (rolling) times the bogies total weight makes the rear wheels of loco to exert more vertical force (due to moment arm) and this adds up to the loco dead weight. The pulling frictional force of loco becomes thus more than the total bogies weight times rolling friction.

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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.

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Levels of autonomous trains While full driverless autonomy is certainly technically possible, and is applied on various routes worldwide, it still accounts for only a tiny percentage of trains running today. New trains are still being designed and built with fully equipped driver cabins.

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One of the primary reasons railroads use distributed power is to increase the pulling power of the trains as the length and weight also increases. By placing additional locomotives in the middle or at the end, the overall pulling power of the multiple locomotives increases, moving the train efficiently and effectively.

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For as long as steam locomotives have been around (and the same goes for ships, aircraft, and other large objects that move), crews have referred to their charges as female.

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A Brief History. 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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Eight notches allowed reasonable control throughout the range of zero to everything. The concept also allowed MUing locomotives as only a few wires, energized in various combinations, could control the unmanned locomotives through the notches.

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Sometimes, yes, but more often than not, that second or third locomotive is part of a modern rail technological innovation known as distributed power. Distributed Power Units (DPUs), as they are officially referred to, are locomotives that operate in the middle and/or at the end of trains.

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World's most powerful electric locomotive Shen24 by CRRC for coal cargo service in China. China: The 28.8 MW 24-axle six-section locomotive develops starting tractive effort of 2,280 and continuous tractive effort of 1,596 kN reaching 120 km/h. Its official operation began in June 2021.

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