I am new to the hobby but have built models all my life including remote control aircraft. I would like to scratch build a coal mine but I am not sure how they look/operate with the exception of some pictures I see on other people's layouts. Does anybody know where I could get a set of plans/details on how the old coal mines operated with respect to loading railroad hopper cars? This would be for a logging and mining layout my son and I are starting to build. Thanks in advance.