Explain gyroscopic effect in trains or railways?

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I'm not quite sure the term "gyroscopic" is used properly here.

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But, there is a phenomenon called "harmonic roll." This occurs when trains are running on "jointed" rail, as opposed to CWR (continuous welded rail) aka, "ribbon rail."

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What happens is each time a car or engine's truck passes over the joint, it takes a slight dip to that side. When it comes to the next joint on the opposite side, it takes a dip in that direction. If allowed to continue, the oscillation becomes greater and greater and can result in over-turned equipment. This phenomenon is at its worst when the train is traveling at a speed of 15 MPH.

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Is this what you meant?

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No, YOU explain it! Or try asking nicely.

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When a train goes around a curve it experiences centrifugal force, and so does anything or anyone travelling on it. Basically the momentum of the train tends to make it want to go in a straight line while the curve is pulling it round, so it will tend to lean towards the outside. The faster the train, the greater the force.

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Railway operators deal with this in 2 ways: firstly, by restricting the speed on curves and secondly, by banking the track a few degrees into the curve - this is known as 'superelevation'.

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Another recent innovation is the 'tilting train', i.e. a train that angles itself into the curve to counteract the centrifugal force pushing outwards.

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British Rail built a tilting train called the 'Advanced Passenger Train' (APT) about 20 years ago but it was not a success. The more recent Italian 'Pendolino' train works better and there is now a British version operated by the Virgin Trains company.

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