This teeny-tiny is a single eggcup from the Missouri Pacific Railroad. The pattern name is "Eagle."
Very fragile on a thin pedestal stem, it is approximately 2-1/2 inches tall -- and indeed was used to serve boiled eggs to railway dining car passengers.
CONDITION is perfect - NO cracks, chips, flakes or repairs. It is extremely clean and the decoration is bright and clear. There is some spotting on the bottom which of course does not show for display (we made no attempt to clean it).
According to our railroad china books, this pattern was first called "Missouri River Eagle" when it was introduced in 1940, made by Syracuse China. This eggcup is not bottom marked (tiny pieces often escaped bottom markings) but there is absolutely no question of its authenticity.
Shenango China also made this pattern for the MoPac, but it's obvious that our piece is Syracuse. Comparing pictures of the bird decoration, the Shenango eagle is quite different. Records of Shenango production are not clear, but it is thought that Shenango may possibly predate Syracuse production.