Reasons for HEAVY JERK DURING MOTORING

HEAVY JERK DURING MOTORING 
a) DEFECTS IN WHEEL SET 
b) DEFECTIVE TRACTION MOTOR AND CARBODY CABLES 
c) PINION BULL GEAR DEFECTS 
d) BOGIE DEFECT 
e) EMI INTERFERENCE 
f) DAMPER DEFECTS 
g) TM SPEED SENSOR DEFECT 
h) TCC CARDS DEFECT 
i) RADAR DEFECT