A train A runs from east to west and another train B of the same mass runs from west to east at the same speed along the equator. A press the track with a force F1 and B presses the track with a force F2.

Earth spins from west to east at equator. To maintain the same speed the first train has to press the track more than normal as it goes against the speed of earth’s surface. The second train gets support from the earth’s motion and it must press the track less than the normal.

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