The narrow gauge boxcar is a "Forty and Eight" (so named because it could carry forty people or eight horses) that was widely used in Europe during the early twentieth century. According the newspaper article, the boxcar at the American Legion
"was part of a 49-car “gratitude train” from France that sent one boxcar to each of the 48 states and the District of Columbia as thanks for the United States’ participation in World War II and America’s aid afterward."
I took a few minutes to detour around the fence and have a look at the boxcar myself before it is moved. There's more to learn about this, but for now I'm just going to post some of the pictures I took.