REMOVE

1. Caboose
2. Passenger
3. Cherry Creek
4. Warm Springs

WHAT

1. Coal (1)
2. Coal Tower (1)
3. Crane (1)
4. Diesel (1)

WHERE

1. Cobre (1)
2. Currie (1)
3. East Ely (1)
4. Ruth (1)

WHO

1. Armstrong, W.R. (1)
2. Cordoni, A.V. (1)
3. Stork, A. (1)
4. Whitmore, J.P. (1)

WHEN

1. 1960s (1)