Main station
From #openttdcoop wiki
Our networks usually have a single drop station for every cargo type or even one for multiple cargo types combined. With thousand or more trains running you can figure these stations have to be efficient and high capacity. Over the years we developed many types of main stations, each suitable for another purpose. First we'll look into the function of main stations and the standards they should meet for different purposes, then we will look into some common designs more deeply.
Demands
One of the most important jam-preventing measurements we take is to keep drop and pickup stations separated. If we would not do this the situation could appear where all platforms are taken by secondary goods trains waiting to fully load, which will obviously never happen when there is no platform left for primary trains to unload.
WIP