If you use trains to transport resources then you are going to want to make sure the train can supply enough resources to last the round trip. This video explains how to calculate this along with a working example. This video also explains the theory behind using buffers for the freight platforms.
If you use trains to transport fluid then you are going to want to make sure the train can supply enough fluid to last the round trip. This video explains how to calculate this along with a working example.
A Train Railway Corkscrew is a technique for moving a train vertically in a small footprint. It's not something you see me utilise in my builds as it's not my style, however for the purposes of a tutorial series it is worth a demonstration.
Trains are another way of transporting resources. While trains are simple in nature, their setup can get complicated if not planned. These episodes go through both a double-ended train and a train loop configuration as well as railway placement techniques.
All vehicles (except for trains) can use recorded paths to allow for transportation of resources. The following series of videos demonstrate this functionality using a tractor to transport coal.