Reading Terminal served the railroad's inter-city and regional rail trains, many of which are still running as part of the SEPTA Regional Rail system that connects Center City with outlying neighborhoods and suburbs, especially to the north. Many of those trains would be converted to electric power in a project that began in 1928 and basically completed in 1933, with the Newtown Branch being electrified to Fox Chase in 1966. Daily traffic peaked during World War II with up to 45,000 daily passengers, then declined in the 1950s with the advance of road and air travel.