Ideal Traction system should processes following requirement:- 1. It should be Pollution free. 2. It should have low capital, Running and maintenance cost. 3. It should have quick starting time. 4. It should have high starting torque. 5. It should have high rate of acceleration & retardation. 6. Highest speeds are possible. 7. It should have easy speed control method. 8. Its braking system should be reliable and causes less wear. 9. It should have better riding quality (less vibration) 10. It should be free from unbalance forces i.e. coefficient of adhesion should be more. 11. It should have lower center of gravity. 12. The locomotive should be self-contained and able to run on any route 13. There should be no standby losses. 14. It should have high efficiency 15. Regenerative braking should be possible. 16. The wear caused on the track should be minimum. 17. Equipment should be capable of overloads for short periods. 18. Capability of withstanding voltage fluctuations. 19. Parallel running usually more than one motor (2 or 4 motors) should be possible. 20. Traction system should be clean & long life. 21. There should be no interference to the communication lines running along the lines.