Rules from page 1.
[2] The challenge MUST be reasonable. Keep in mind this forum spans the globe - so for instance I would not ask for a picture of a Saturn V Rocket (I'm right down the road from Cape Kennedy) - since there are only a few examples here and a couple other places in the states - this would be an unreasonable challenge. So, if you make a challenge that is difficult it will slow things down and we don't want that. Be Specific and Simple: A picture of a barn = GOOD, a picture of a barn with three cows and a red rooster = BAD.
Also, please do not post picture just because you want to, knowing it will be difficult to challenge.
Diesel, but as the challenge mentioned any train. I'm in the same boat, where are there steam trains now.