REMOVE

1. Coal
2. Operations
3. Davidson, H.A.
4. Cannon, L.G.

WHAT

1. GMO (5)
2. Structures (5)
3. Steam (2)

WHERE

1. East Ely Yard (2)
2. Cobre (1)
3. Decoy (1)
4. Goshute (1)

WHO

1. Boese, P.R. (5)
2. Roper, F. (5)
3. Douglas, T. (1)

WHEN

1. 1910s (5)