base fare includes free transfer to the subway–surface lines at 30th, 15th, and 13th Street stations, as well as to the Broad Street Line at 15th street. While the Broad-Ridge Spur connects at 8th St. Station, there is no longer a free-transfer passageway between the lines. Transfers are available with a SEPTA Key card; the first transfer is free while the second transfer costs $1.00. SEPTA's "TransPass" and "TrailPass" weekly/monthly zone-based passcards loaded on a SEPTA Key card are also accepted as fares. In FY 2005, 25,220,523 passengers rode the Market–Frankford Line. Weekday average ridership of 178,715 made it the busiest line in the entire SEPTA system. The Market–Frankford Line required 142 vehicles at peak hours, cost $86,644,614 in fully allocated expenses, and collected $54,309,344 in passenger revenues, for an impressive farebox recovery ratio of 63 percent. On February 11, 2008, SEPTA expanded morning and afternoon weekday service with off-peak trains running every six minutes instead of eight. This represents a 12% increase in MFL Service throughout the day. Operating times and headways A local trip along the entire line takes about 40 minutes. Trains run from approximately 5:00 am to 1:00 am, with a timed-transfer at 12:30 am at City Hall station to connect with the Broad Street Line based on final trains. The Market-Frankford Owl bus service replaces the subway throughout the night Monday through Friday mornings, stopping at the same locations as the subway trains. The line itself ran 24 hours a day until it was eliminated in 1991; it was reinstated on June 20, 2014, for Friday and Saturday overnights only on a trial basis. It was made permanent on October 8, 2014. Since 2014, the line runs nonstop from 5:00 a.m. on Friday to 1:00 a.m. on Monday morning. The Market–Frankford Line carries a daytime frequency of six minutes on weekdays (off peak), and ten minutes on weekends. It runs every 12 minutes during night service, with a 20-minute headway during weekend night owl service, and 15 minutes on the night owl bus service Monday through Friday mornings (late Sunday through Thursday nights). Rolling stock The original cars for the Market Street subway, numbered 1–135 and later designated as Class A-8 by SEPTA's predecessor, the Philadelphia Transportation Company (PTC), were built by the Pressed Steel Car Co. of Pittsburgh, Pa., between 1906 and 1911. An additional set of cars, numbered 136–215, were built by the