I pictured the cars going into the mine and then careening down a hill, roller coaster style. That would be a slope mine. Because this is a drift mine, they are entering the side of the hill and rolling on a horizontal path - much less exciting. This diagram helped me:

Miners are a rare breed of men. The U.S. coal industry was instrumental in the war effort both at home and on the front line. The West Virginia University football program pays tribute to the West Virginia coal mining industry with the “Mountaineer Mantrip” before each home game at Milan Puskar Stadium.

https://wvusports.com/sports/2017/8/2/mountaineer-mantrip.aspx

Patrick

That doesn't look like much of an amusement park ride!

This ride is "Descent Into Darkness"