TC reported TIMS show Inverter 1 & 2 failure at car 1523. Fault was intermittent. ~~~~~ Checked TIMS, found FC 821, 820, 128 -  Inverter 1&2 failure + propulsion speed sensor failure. Fault able to duplicate in depot. Checked the VVVF components, IGBT, CCD fuse, traction motor, VVVF controller & relay panel, OK. N.ALAI.M.K/07.11.21 ------------   Swapped the speed sensor from 2523 to 1523, fault transferred. N.AKUMAR/09.11.21 ------------   Replaced speed sensor. Function test, OK. Limited movement and depot shunting, OK. N.AKUMAR/09.11.21 ------------