Rotational Speed Sensor for Traction Motors of 6000 HP Three Phase Drive Locomotives of Indian Railways was developed and supplied as a replacement to the existing passive Wiegand Type Sensor, which continues to have reliability problems. This is an active sensor with strong pulses having two output channels each with direction encoded signal making it 100% compatible to the Wiegand fed locomotive Electronics needing no modifications while retrofitting. The mechanical size and interface is identical to the existing Wiegand sensor and is powered directly by locomotive battery at 110V DC and can handle a variation of 77V to 138V. The sensor complies with IEC-60571 and IEC-61373 test standards.