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Mining rock for 81 years
https://www.railpictures.net/photo/886853/
Herzog is a railroad builder/maintenance company. Those Herzog ballast cars have a solar panel and GPS systems in each car. They are side-dump cars that can lay a pile of ballast next to the rail at 15mph as programmed by GPS for maintenance areas along the rail line. Later some maintenance machines manipulate the ballast between the rails and ties.