Ouch! We normally are looking to clear low objects and don't often mention the cab's roof on most steam actually kicks out even further up high. Forcing the model rear to shift to the outside and the nose to the inside, then the opposite directions, is a good idea too as they don't track exactly the same on each pass either. While your discovery is "larger", mine was deeper into being finished, consider yourself lucky 
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I also found my diesel handrails stuck out more than I thought at a medium height too. SW; not even big! But they tick each lap. On the next loop I ran every loco. I "only" had 18 at the time, not a big deal. More like a night of fun to rest up 
Mural? What are you considering? I like the little clouds too A lot! Sky like that and a mountain made me fall in love with NC and Penn. both. I'm a bit disappointed already 
Maybe adding a drawn horizon for more depth?
