v5 TrainYard Rename stations as type of train you want to show up and no limit, such as [virtual-signal=signal-L][item=iron-ore] [virtual-signal=signal-U][item=iron-ore] and change combinator to on to stop the trains here. Trains of those types will slowly appear until they stop here. If a train is constantly busy because routes are closer somewhere else, at least you only have to manually send a few trains at the end instead of all of them. Set train limits on stations to 0 when not in use.