*Stations can handle 1+ trains at a time
*Priority based on fullness for pickups/emptiness for dropoffs(+random perturbance to help items in low supply distribute to ALL dropoffs)
--Limitations--
1) Usage of red wire signals through radars partially limits usage for other reasons
2) Rarely, more than the requested trains will be dispatched
3) Max 1 train/tick per request
4) Cannot mix different trains/stations, e.g. 1-4 and 1-6 for same signal request