Some things on display at the world's largest tractor and engine show 2024

Hand made wooded models of train engines,around 3-4 feet long.
Hand built miniature working model steam engine,around 5 feet long.
And a salesman sample concrete mixer with hit and miss engine for power.Exactly like the real one but about 2 feet long.Used at fairs and trade shows to demonstrate how it worked ( and yes at one time it worked) making miniature batches of concrete.