Best thread for ages! Everything I can think of - someone else has just beaten me to it!
Except for putting pennies (old ones) on the railway line (steam trains of course) and seeing them flattened when the train went over them.
Oh and the smoke at Snow Hill station in Brum. Milk being delivered by horse and cart. Mom swares thats where I get my passion for horses from, and taking over 12 hours to get to Cornwall and not minding at all.