Visitors walking along M Street in southwest Washington, D.C. will mostly note an upscale, developing business neighborhood near Nationals Park—until they come face-to-face with a series of anachronisms from America’s past. It can be a bit confusing to find a 19th-century rail trolley at a busy intersection or share sidewalk seating with an eight-foot red channel marker, until one realizes the perimeter of the U.S. Department of Transportation is an outdoor museum of North American transportation. The Transportation Walk is part of the U.S. Department of Transportation outreach to the…
