These two cars represent a brand new (built in February of 2015) series of bulkhead flatcars operated by Essar Steel Algoma with their own reporting marks (ESAX). The first example above, ESAX 25, was photographed in the Huron Central yard in Sault Ste. Marie on July 12, 2015. Almost an entire track appeared to be filled with these empty cars.
The second example below, ESAX 38, was photographed with a load of steel in a westbound Canadian Pacific train at White River on July 15, 2015. Presumably this car (and several other steel loads, mostly coils, next to it) were interchanged from CN at Franz.
We see these ESAX cars partnered with CN, WC, and BCOL cars coming through Fort Worth on BNSF’s Tulsa – Temple train. Quite a bit of the loads from what I can tell go onto towards Houston and Mexico based on the train they ride.
Completely forgot to mention with the two Atlas 62′ cars I just picked up, going to re-letter for Essar to represent steel traffic moving down through Michigan via our Mackinac railcar ferry. The fictional MCIS has trackage rights on CN from Trout Lake to Ontario side of the Soo to serve Essar.
You’ll probably be one of the first people to model one of these ESAX cars.