The tendency of sticky coal to hang-up in bottom dump rail wagons has been a long-term problem in the mine-to-ship transportation of Queensland coal. Such hang-ups can frequently extend the time taken to discharge a 10,000 metric ton (mt) train load from the nominal two hours to four and sometimes to periods in the 10-to 15-hour range. That's bad news for a system that is often under pressure to maintain acceptable delivery schedules.
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