Would anyone be interested in the "Photography Game" here?

[Steamtrains]

I agree with Bruce and Dr. W. The rules are what makes this collection of pics different from others. As a lot of pics are diesel related, I (and others, I presume) are at a loss if a picture properly follows the previous one. You all could give a hand if you identify the kind of engine posted and help keep the thread "on track", as it were....