Not about trains but worth a chuckle, in the early 1980's I worked for a company modifying large metal forming presses, one day I brought my 12" Post Versalog sliderule to work to determine speed ratio's, one my contempory engineers many years younger,asked if I knew how to use the sliderule, he was trained with the calculator, he also said the sliderule was extinct. I took his calculator, popped out the batteries, and gave it back to him he replied the calculator was useless without batteries. I said," Alex, I might be an old dinasour but I am not extinct". Everyone had a good laugh, including Alex and I, from this conversation.