The power supply technology used in train interiors have indirect coupling with axle. This makes system lesser efficient and bulky. The paper deals with improvement in the performance of power supply system. Magnets mounted on axles with stator of slotted hollow cylinder will make alternator that will be robust and light weight. This cheaper system will be simple and easy to use. The problem of alternator pulley and axle pulley damage can be solved. The output voltage from alternator will have a many frequencies .Hence we will pass it through converter cum regulator insuring total elimination of harmonics . The pure DC output from it will be feed to batteries and supply.