My first view of the tunnel was in the dead of winter. In spite of being in the middle of the forest, it was totally silent. Mamiya GA645 / Kodak Pro 400
A window for light and air pokes above the big arch in the hallway. Most of the interior ceilings were broad brick archways.
Lost words over the auditorium entrance.
The complex was so big that trains could make deliveries through the middle of it, passing below this striped skyway.
A skyway 100 feet above this office crumbled one day. This is what happened when those two met. High-impact love.
A big sliding fire door opens onto a train dock.
The grain-centric buildings had automatic fire doors.
The largest room was the diesel laboratories, which tested various devices and fuel additives to make it safer to mine underground with diesel trucks and other machinery, such as at White Pine Mine, Michigan.
Someone had helped themselves to one of the safety posters before my visit.