A new United States Postal Service (USPS) stamp series commemorates historic railroad stations. These buildings emerged as important centers of commerce and travel in the 1800s, but a sharp decline in rail traffic by the 1960s and early ’70s left many of them endangered. Each of the five stations highlighted on the stamps is listed on the National Register of Historic Places and survives as an active rail station and/or an adaptive reuse project. See below for some key facts and figures.