NYPIRG's Straphangers Campaign released its 2007 report on Subway Schmutz today and there was reason for encouragement. Overall, car cleanliness improved slightly between 2005 and 2007, but there was significant improvement on the 7 and L lines. The L line actually has the cleanest cars in the system according to Straphangers, with 88% of cars earning a clean rating versus 61% in 2005. The 7 train line was tied for second place, with 78% getting......