"Clang" is more arguable. Yes, it's the sound of metal hitting metal. But "jail bars closing" is very specific, and "clink" definitely has that specific connotation.
And for Basketball shoes i tried "Creak" and "Screech".
Though I can see toot toot instead of choo choo, choo choo is definitely not the sounds of the wheels being turned.
Also, I loved the allusions to the Wizard of Oz and Monty Python and the Holy Grail. :D
Or so my Speak-and-Say tells me.
To stop all the arguments and make the question less ambiguous I would also suggest using train instead of train whistle.
(even looking at it now train whistle choo-choo looks weird to me, a whistle doesnt say choo choo, but pffrrrttttt!! in my personal experience ;) train signal allready seems better)
Things that make me slap my forehead and go D'OH!!: I tried 'clank' for jail bars being closed, thought and thought and didn't try 'clink'.
Clue: Thomas the Tank Engine YouTube Poops use this when they are rushing.
Sorry, couldn't resist. Great quiz tho.
tu-whit tu-woo for owl sound