Priorities between trains Sample Clauses

Priorities between trains. The present models have not used the possibilities to specify priorities between trains. The concept of priority is complex. Different types of priorities exist and they are also sometimes dynamic and context dependent. Both the models and input data for the specific context must be specified. For the iron ore line the following basic priority rules exist today:  Loaded iron ore trains have high (highest) priority, even if they are delayed.  Iron ore trains and freight trains have high priority if they are close to an im- portant dead-line (miss important events).  Trains on time have priority over delayed trains. Also other rules exist, e.g. concerning maintenance work etc. For the analyzed scenarios, see fig 15, 16. 20, 21, we can see examples of priorities that are not according to these rules. Trains with high priority are not given priority, which leads to many stops, long delays for these trains and high energy consumption. A test, where a human traffic controller was asked to solve the presented scenario, showed that if they removed unnecessary stops and used relevant priority rules that achieved the following:  All loaded iron ore trains arrive at destination (Narvik) on time  All other trains, except one, arrive on time.  One train (41905) will be a few minutes late. Probably, and this must be verified in future experiments, the PMM models can solve this problem if adjusted and supplied with relevant input data.
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