not that unusual even though this was a bit larger than usual in 1917, but it's unusual in that after it was retired in 1947 it was sent to Honduras

In 1917, Sumpter Valley Ry built a new class of box cars, that were larger than previously on the roster at a cost of $908.36 each.
These would be a total of 5 1600 series cars like we see in the attached shot of #1604.
They were 36' long, 8' wide and a height above the rails of 11'5", (7'5" inside).

They had a capacity of 60,000 lbs, with a light wt. of 24,000 and road on Vulcan "Bettendorf style" trucks.

In 1939 #1602 and #1604 had their floors lined with steel for hauling ore concentrates.

All 5 of the cars lasted till retirement of the mainline in 1947, when they were sold and shipped to LaCeiba, Honduras, Sep. 1947

https://www.facebook.com/photo.php?fbid=2188707991197030&set=gm.1262400067225482&type=3&permPage=1&ifg=1