Southbound O721 close-ups

"Name that cut of rock" - When I see a loaded hopper on O721, I wonder what it has, but here you can see the commodity. Looks like ballast...

Gypsum didn't seem as easy to get on O721 as it seemed in December, where three straight catches yielded it. TTZX 865137 marks the third time I have seen it in the video era.