John:
You make me drool. I spent 35 years working with data like this as an industrial engineer and a staff assistent to the operations vp of a steel company. I would love to see more data and see if a pattern of train and commodity can be determined. I find the coal movements east in your previous data interesting as by 1956 the RGS is no longer operating which leaves only the mine at Minero and perhaps the one at Lumberton or somewhere along there working. I never thought of the Moniro mine as a large producer.
Frank