If you need more materials, XP or Gold, the maglev train is the answer. In this trick you can call a Maglev express instead of an ordinary express.
A Maglev track, trains at depot, and at least one whistle.
Step 1: Send all non-Maglev trains on the station to block every non-Maglev track.
Step 2: Dispatch the Maglev train(s).
Step 3: After you run out of whistles, send the trains back to depot, or use them.