This photo of the Car Department tracks in St Thomas is a wealth of detail information.
First is all the short bits of track holding spare wheelsets. There a lot of them and note the way the rails are doubled up to gain space by offsetting pairs of wheelsets.
Then there's really narrow gauge track for some kind of work cart. I'd love to see a photo of the cart. And note how the rail joints are not offset.
There's that water supply in the foreground. Simple enough, but it's a detail often overlooked.
Just behind the caboose, we can see the lights on the pole. I do know from other sources that there were 2 of these poles. The 2nd would be to the right of the photographer.
If you look closely you can determine where it's cinders and dirt, and where the weeds and other greenery would be.
Lots of detail info to work with here.
I find that I spend more time looking around the edges and in the back ground of photos than I do at the primary subject matter in railroad photos. There's so much to see and to learn about.