Since its takeover of the Regional Rail System from Conrail in 1983, SEPTA has made numerous efforts to adjust its facilities and operations to the needs of a modern regional rail system. In order to meet the needs of a modern transit-type operations of regional rail with shorter headways and greater operational flexibility, the infrastructure, such as track layout and signals, is one of the elements that requires changes. The current infrastructure was originally designed for freight and long distance railroad operations. This study represents part of SEPTA's efforts to modernize its regional rail infrastructure and operations in a cost effective way.