The blue and orange Subway lines in Philly are not light rail. Light rail in Philly would be the green lines heading into west Philly, the trolley on Girard Ave (55?) Heading east/west on the northern edge of the downtown core, and the lines heading out west from the 69th street terminal. Interestingly, they cover the spectrum, with the 55 in traffic all of the time, the green lines underground on dedicated rails on the most congested part of their routes and in mostly two lane traffic for the rest, and the high speed lines on dedicated tracks connecting the far edge of West Philly, where the market Frankfort terminates, to outer suburbs.