Are train wheels magnetic?
The wheels on a train are not magnetic. They are steel wheels and the use of steel helps to reduce friction and propel the train forward.
A typical train has wheels and rolls on metal rails. It's drive wheels are driven by a steam engine, a Diesel engine, or even electric motors powered by the rail system or overhead wires. An electromagnetic train, on the other hand, does not ride on wheels, or have an engine, per se. It is suspended from it's track by a powerful magnetic field generated by electro-magnets in the track and train. In addition to providing…
Yes, train wheels remain in contact with the track at all times. The tracks support the weight of the train. They also guide the train. The wheels are shaped such that the train remains balanced on them. Any slight movement of the wheels sideways is automatically corrected so that the wheels remains exactly on the middle of the rails. If the wheels were not in contact with the track, the train would be flying.
Because there's no friction between the train and the track. In an 'ordinary' train, friction between the wheels and the rails takes a lot of energy to overcome before the train starts moving. In a Maglev train, the train itself actually 'floats' above the track on a 'cushion' of magnetic foirce. With no friction to slow it down, the train is capable of much higher speeds.