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2. Push–pull train - Wikipedia

   en.wikipedia.org/wiki/Push–pull_train

   A push–pull train with two control cars and a locomotive in the middle. Push–pull is a configuration for locomotive -hauled trains, allowing them to be driven from either end of the train, whether having a locomotive at each end or not. A push–pull train has a locomotive at one end of the train, connected via some form of remote control ...

3. Pull-rod suspension - Wikipedia

   en.wikipedia.org/wiki/Pull-rod_suspension

   In cars, suspension refers to the system by which the vehicle maintains contact between all of its wheels and the ground. This is commonly achieved via use of dampers and springs, providing downward forces on the wheels to counteract impact shocks. However, in push-rod suspension systems, this strut is mounted across the chassis, parallel to ...

4. Handcar - Wikipedia

   en.wikipedia.org/wiki/Handcar

   Handcar. A handcar (also known as a pump trolley, pump car, rail push trolley, push-trolley, jigger, Kalamazoo, [1] velocipede, or draisine) is a railroad car powered by its passengers, or by people pushing the car from behind. It is mostly used as a railway maintenance of way or mining car, but it was also used for passenger service in some cases.

5. Automobile drag coefficient - Wikipedia

   en.wikipedia.org/wiki/Automobile_drag_coefficient

   The drag coefficient is a common measure in automotive design as it pertains to aerodynamics. Drag is a force that acts parallel to and in the same direction as the airflow. The drag coefficient of an automobile measures the way the automobile passes through the surrounding air. When automobile companies design a new vehicle they take into ...

6. Pullback (differential geometry) - Wikipedia

   en.wikipedia.org/wiki/Pullback_(differential...

   Pullback (differential geometry) This article is about pullback operations in differential geometry, in particular, the pullback of differential forms and tensor fields on smooth manifolds. For other uses of the term in mathematics, see pullback. Let be a smooth map between smooth manifolds and . Then there is an associated linear map from the ...

7. Control car - Wikipedia

   en.wikipedia.org/wiki/Control_car

   Modern German InterCity Steuerwagen control car. A control car, cab car (North America), control trailer, or driving trailer (UK, Ireland, Australia and India) is a non-powered rail vehicle from which a train can be operated. As dedicated vehicles or regular passenger cars, they have one or two driver compartments with all the controls and ...