Coaling tower chutes were complicated. They had a U-channel for a chute, but it was hinged in the middle so it could be pulled down and extended to whatever tender needed filling. Plus it had a "hood" at the end, really a deflector that directed the coal down straight down from the end of the chute rather than shooting off the end and past the tender bunker.
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Here's an apparently working brass model made in HO or O:
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Not sure if an N scale one in FUD would be feasible. And to have chutes in various (non-operating) positions means at least a two-part assembly.