I am planning a small layout with a town on one end and a small yard and locomotive facility on the other end. The layout will be in the late transition era, and so the facility will be a steam facility that is transitioning to diesel. I have an outbound track with a coaling tower and a sand station. The sand station has an old tower for steam locomotives and a new tower for diesel locomotives. It also has a bunker for sand that is adjacent to the drying house. My question is what sort of facility or equipment do I need for getting the sand into the bunker. I have not been able to find useful information on this question anywhere that I have looked.