![](https://affinis.us/wp-content/uploads/2018/03/topo-survey-argentine-yard.jpg)
Over time, three, parallel tracks at the Burlington Northern Santa Fe’s (BNSF) Argentine Yard in Kansas City, Kansas had been sinking. The rails run through a large, on-site building where fluid changes are performed on the trains. As engines pulled in for maintenance, the trains were beginning to bottom out on two of the three rails.