openttd
I have super large station in a city of 175,000, so coverage of station is fully covered by buildings. But I never seen more than 1,500 passengers in my station. That's bad, because if some Airbus A380 land on the linked airport, they will totally drain my station. I made some feeder services by buses, but passengers from there won't remain longer than couple of seconds and I still only have around 1,500.
Is there any way to "store" more passengers in station?
There are a number of reason why the industry may not be supplying any goods to your station, but the most likely reason is that the station in question have low ratings for that particular good.
Stations ratings are based on, generally speaking, how often vehicles pick up goods from the station and how much goods have accumulated there. The OpenTTD Wiki provides the complete table: http://wiki.openttd.org/Game_mechanics#Station_rating. You can see the station's ratings by clicking on the 'ratings' button in the station interface.
If your station has a lower rating compared to your competitor, your stations will receive less goods from the industry, and if it has extremely low ratings (after a vehicle crash, for instance) then the industry may stop supplying goods to that station entirely.
Also note that it is impossible to get 100% transported rate as industries do keep a certain amount of the output to themselves. (Source)
The % transported value reported by an industry is the % of its production of the relevant cargo last month that was placed in to any station - so it is the total of all its production placed in all stations (across all competitors).
If you have one station and are only transporting 50%, that tells me the station probably has rating at about 50% for that cargo type - in the case where there's only one station it, receives it's the maximum output multiplied by it's rating for each cargo. Note this cargo is placed in stations over the entire month (not in one go), so your rating at the end of a month won't match up exactly due to rating fluctuations over the month.
So, your first point of call should be to check and probably increase the collecting station's rating.
Station rating usually moves by at most ~0.78% (2/255ths) every 2.5 seconds, so it takes time to improve, as such the fastest method (but also temporary) to boost rating is an ad campaign, because it makes the rating jump immediately. The long term solution is to make sure there's as few goods waiting as possible and that there's no big time gaps between pickups as outside of ads and crashes these have the biggest impact.
There are a lot of factors to station rating, see so the wiki for full info on what effects what.
Best Answer
In general, you don't want to do this. Having 1500+ units of cargo waiting at a station means you're losing a third or more of your potential station rating (and thus, cargo generation). Instead, you want to increase your rate of flow, both in and out, so that vehicles will load quickly and completely even without cargo waiting.
That said, there are ways of doing this.