Kinda funny (not haha funny) you worded it that way. There is a section of former Conrail line north of Columbus OH that has a large Scotts (lawn care supply manufacturer) manufacturing complex on both sides of the mainline. This is true "dark" territory, no signals at all. Scotts has a contract switching company handle the work in their plants, and it requires access to either side of the mainline. Twice in a year, the contract crew reported "clear" and released their authority but failed to line a mainline switch back. First time a container train found it at 49 MPH and made a big mess. Second time a track inspector on routine patrol found it.