Train encountered power fault at rear M2car while departing station. Reset - ok. ~~~~~ Train encountered power fault at rear M2     Downloaded ER and fault trace on PTU006.Checked #2626 charging resistor,L1,L2,K1 & K2 contactor all ok.Checked BCH,INV1 & INV2 ok.Checked CCD shoes & fuses all ok.Checked earth cables ok.Carried out limited shunting,spotted smoke with loud bang coming from T/M4.Isolated PRCB for #2626 to raise notication to RSW for T/M4 c/o. Not: 2123594 raise to RSW. Checked by Jack/Koh. 23/01/20