The KCET blog tracks the whole long story of how rail got reintroduced into LA, the city that had the largest electric trolley system in the world in the 1920s — with 2,000 cars running daily over 1,000 miles of track — and that had no passenger rail system in 1990, until the Blue Line opened. Today we have about 100 miles, though the system will grow to 200 miles when all the Measure R-funded lines are built. On the KCET blog.