My 1-7/8 cents worth. In order of preference...
1. #2 nice classic shot, good fall color. Good public appeal
2. #1 good color, a good alternative if a vertical shot is needed.
3. #7 every one likes a Rock Tunnel shot. A bit "static" looking, but it shows the awesome country the RR runs through.
4. #6 cool shot that only the fans would like and enjoy.
5. #5 an interesting "fill" shot with drama, a bit of human interest, but not something to grab the public. It doesn't show anything about the RR, other than its a "big steamy thing"
6. #3 a personal favorite, because I'm in it talking to my fireman wondering if that cow is going to get us before we roll-by the passenger train. But, were selling passenger trains not frieght charters...
7. #4. don't like the dirty, flat black locomotive. Against the sooty tipple the whole thing looks dirty and drab, no contrast....