“Burlington Zephyr postcard - this is the original 9900, later named the Pioneer Zephyr; it was the only one with the curved brow in the front window line, on the later Zephyrs the top window line was flat. Noting the viewing platform at left and the ramps laid across the tracks, it looks like it’s somewhere on one of its early (1934) exposition tours prior to entering regular service. The Pioneer Zephyr is on display today at Chicago’s Museum of Science and Industry.”
Source: flickr.com