Some copy that explains the page: The gallery is not working correctly. I have put in a ticket with the developer.
I think it might be good to have at least three galleries as there are so many images.
Gallery 1 Images Before there was a trail (below) This one would be pretty static as there would be few new images.
Gallery 2 Events pertaining to rail trails
Gallery 3 Pictures of the rail trail after completion.
2 and 3 would continue to grow. We should encourage or require tagging and figure out what the tags will be. Maybe the year, town, for events, the name of the event. You would be able to sort based on tags so there is a finite number of them you can use.