Train encountered power fault at car 2654 while arriving station. Reset - ok. Fault reoccurred depar ting RFP(NB), CTH(NB) & DBG1. ~~~~~ 2654 encountered power fault arriving station. Reset- ok. Fault reoccurred departing RFP(NB), CTH(NB) & DBG1. 2654 Power fault, unable to reset.  2654 found FC 143 (Propulsion K2 failure). Replaced K2 contactor. Limited movement - OK. No power fault.  Lee PT/Alcus 44251 #2654 K2 Contactor S/N : OLD : 1041284 3.1/03 NEW : 1055494 2.1/15