The Peninsula Corridor Electrification Project (PCEP), sponsored by the Peninsula Corridor Joint Powers Board (JPB), is a key component of the Caltrain Modernization Program that will electrify the existing commuter rail system to upgrade its performance, operating efficiency, capacity, and reliability. The corridor traverses 17 cities and three counties, with the northern end located in San Francisco and the southern end located in San Jose. The PCEP includes two components, installation of infrastructure needed to electrify the line including overhead catenary and power substations and the purchase 96 Electric Multiple Units to replace approximately 75 percent of the existing diesel fleet. The JPB estimates that when the project is complete, it will increase capacity in the corridor by 20 percent, which exceeds the ten-percent minimum required by law for Core Capacity projects.