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To get a contract to tier 4 and 5, you need to serve the industry you whish to upgrade, for several days. After completely serving the industry for 1 day (supply it with all cars offered and remove all cars when it requested to do so) you will get the option to upgrade one tier.
After serving two or more days, you can increase the tier by more than one level.
There is also an initial interchange service to fill up industries storage in the beginning with higher demands on shunting space requirements.