How the action of differential is achieve in railway wagon?

Question

as in four wheeler,there is a differential gear in back wheel axial which provide different rotational speed to inner & outer wheel while negotiating at a curve.How this action of differential is get in railway wagon as there is a fixed axial.

Answer 1

Railroad wheels are mounted on swivel bogies so that they turn separately; also, the running surfaces are tapered so that they can follow the inner and outer rails at a slightly different wheel diameter to account for the difference.  Finally, railroads use only very shallow turn radii, so the differential action is not needed.

Answer 2

There is no differential.

I realize this sounds impossible but for several reasons it works, first realize that curves on a railroad have a much wider radius than roadways so the wheels dont have to turn as sharp.

Secondly, the axles on a railcar are mounted on a subassembly called a truck in the U.S. or bogey in the U.K., this truck pivots seperately from the railcar and follows the curve, bringing the car along with it.

Train wheels are very slightly tapered so as they go around curves they are able to negotiate the turn.

If you sit near a sharp curve on a railroad, you will probably hear the steel wheels squeel and shriek as they go around the curve, this is the wheel flanges rubbing on the rail. there is some friction of course but it is minimal.

There is not nearly as much friction between steel wheels and rail as rubber tires and pavewd roads, that is the reason trains are so much more efficient than trucks.

Very observant, good question.

Answer 3

There is no differential, the speed-differnce between the wheels is acomplished by the shape of the wheels alone. See http://en.wikipedia.org/wiki/Hunting_osc... for details.