Why trains fascinate us

I am sure we remember this memory from our childhoods: a chugging train full of passengers who we used to wave enthusiastically at and wonder as to how far and where all those people were going. The sound of 'chukk chukk' and the belching smoke running up in billows as the train moved ahead gave us the twinkles in our young eyes! How fortunate those passengers were to be travelling in the train, we thought! So exciting! Trains were wonderful! In the playground, we mimicked the trains as we lined up one after the other, with our tiny hands holding the waist of the child in front of us, and the one in front leading us gleefully in any direction whatsoever and all of us shouted "chukk chukk"!!!