Hello, You'll have to forgive me, as I am a complete novice when it comes to trains and railroads. I just received my grandfather's HO train set, and I hope to build it this winter. I have a lot of experience building model car kits, so I think I have the skills to do this hobby as well. However, I'd like to do it right, and so I need to learn what some of these trains and accessories are and what they were used for. First, I have some small structures and accessories. I was hoping someone could tell me what these structures and accessories are, what function they serve on a railroad, and what era they generally originated from (I'd like to have the railroad scene depict the 50's to early 60's). Second, I have a Union Pacific deisel engine. I was wondering what year this train (not the model, but the real thing) was first built, and what purpose did it serve (I'm assuming it is was generally used for pulling large freight). Third, I have an unmarked steam engine. I was wondering what year this train was first built and what purpose it served. Also, was this a coal engine? Finally, I have a coal powered steam engine with Omaha markings. What year was this train first built and what purpose did it serve? Thanks everyone for your help. I can't wait to put my grandfather's old train set to good use.