I posted these three years ago or so. Haven't looked through the recent lists to see how many if any had been used, so here are some of my ideas, not necessarily in any order:
1. On Time
2. Critter Encounters
3. Old Reliable
4. Casey Jones Complex
5. Personification (photographer's self portrait in models)
6. Sunset (or sunrise), Twilight?
7. Oops! (model train wrecks)
8. The Ubiquitous Box Car
9. Over the River and through the woods (Thanksgiving - November?)
10. First Class
11. Inspiration (recent shot of prototype that is modelable).
12. Silhouette
13. Loco Motion
14. Recession
15. End of the Line
Some of them are purposely vague to allow more creativity in the interpretation.