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This item is an internal arch for an extension to the Atlas N scale Viaduct. If you were to buy all the peices necessary from my store, you can create ends to the viaduct in order to make it look similar to Rheneas Viaduct from the Thomas & Friends TV series.
In order to construct it, you'll need superglue and paint, then simply place all the peices together and secure them with the glue and paint it to your liking.
The images shown are test prints by my home 3D printer, so they are slightly rougher than the ones you would recieve from Shapeways, and my construction was rushed and imperfect, so yours if done correctly should be fine.
If you have any comments, questions, or quesries, leave them on my social media links below or on my Shapeways store. until next time, I wish you dry rails, smooth running, and happy shopping!