I found the following article on the Sugar Land Railroad in the August 1971 issue of The Imperial Crown. There are a few mistakes and items needing clarification, which I'll try to pin down in future research. (Note the author refers to Highway-90A as Highway 59. I'm not at all sure about the dates and location of track extensions.)
The Sugar Land Railroad is a fast-fading memory in Sugar Land.
The Sugar Land Railroad is a fast-fading memory in Sugar Land.