Today we say happy 42nd birthday to the Walt Disney World monorail system. The last of 337 concrete beams completed the original 6 miles of track on April 15th, 1971. The first monorail was also lowered onto the beam on that day. The monorail system is almost an attraction unto itself. It carries more than 150,000 passengers to the Magic Kingdom and Epcot each day. I took this picture back in 2011.