Large Scale Central

Question about RailOp, for those of you in the know

I have a question about how RailOp would handle this scenario.

Coal colliery supplies 10 cars of coal per day.

Power plant (the only industry that takes coal) has a capacity of 5 cars, and takes a day to unload those cars.

During an ops session, where would those extra 5 cars get stashed? Is RailOp smart enough to know that it cant put 10 cars at the power plant, or is it up to the operator to drop them somewhere else and then manually tell RailOp where those 5 cars are?