Their information is incomplete.
The 199002 has all the characteristics of a GM&O rebuilt caboose. Generally, the Extended Vision Caboose didn't start appearing until the late 50's early 60's.
Here's a photo of a sister caboose:
Alton/GM&O/ICG caboose information HERE.
An Ex-IC Extended Vision caboose is a slightly different animal, built with end "porches."
Rusty