Hi all, my first post here so first, I'll say hello. Hello. My question is this. I'm trying to figure out how to go about getting an approximate power requirement for an expanding light rail design. The idea is to figure out what it takes to propel a single self propelled train car based on it's weight so that I can continue adding cars and still be able to calculate the required power. Now I know this is a very complicated question but maybe someone can give me a general sense as to where I can start.