REMOVE

1. Signals
2. Passenger
3. Structures
4. Currie

WHAT

1. Depot (6)
2. Excursion (5)

WHERE

1. Cherry Creek (1)
2. Cobre (1)
3. Dolly Varden (1)
4. East Ely (1)

WHO

1. Liverani Collection (4)
2. Unknown (2)
3. Jackling, D.C. (1)
4. Keith E. Ardinger (1)
5. Roy Gabriel (1)

WHEN

1. 1980s (3)
2. 1950s (1)
3. 1960s (1)