TC feedback CAOS cover is broken.equently, TC also feedback train is jerky and saw arching atcar 1521 when train pass by the crossover S208A/B at both b ound. ~~~~~ 3521 TC feedback CAOS cover is broken. Subsequently, TC also feedback train is jerky and saw arching at car 1521 when train pass by the crossover S208A/B at both bound.  3521 CAOS cover replaced & sealed. #1521 found A1 CCD shoe fuse 'OC' - replaced. Replaced B1/A2/B2 CCD shoes. Checked CCD shoe fuse ohmic value - OK. HV equipments & CCD height checked - OK.  Chan SW/Hanafi 44153