How is automatic control of train loading at refineries achieved?

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The most recent job I had was to fill trains with gasoline and diesel. I’m wondering if any of you know anything about this process? The main issues are as follows: 1. Under normal circumstances, how many flexible hoses are used per loading, and what should be the flow rate for each hose? Of course, a centrifugal pump is used to supply oil to these risers ； 2. How is oil spill control achieved? The front end of the flexible hose is equipped with an electro-hydraulic valve and a flow meter. When the oil in the first loading hose is in place, the electro-hydraulic valve closes; at this point it is necessary to open a new hose, otherwise the flow rate in the other hoses will increase. How can this be achieved? Or in the event of an accidental oil spill at the flexible hose connection, should interlocking be used to stop the pump? …