In 2006, Amtrak instituted a program that coupled Reliability Centered Maintenance (RCM) with Root Cause Analysis (RCA) to increase rolling stock reliability. The RCM-RCA program at Amtrak combined features of RCM and RCA into a unique methodology to achieve success. A case study of the High Horsepower electric locomotive (HHP-8) power module failure RCA project is described in this paper. The initial focus of the RCA was a persistently high failure rate of power modules. Power modules are expensive to purchase and labor intensive to replace. Additionally, power module failures take locomotives out of revenue service.