Shouldn't have been a 911 call, but the fire department does respond to this kind of thing because they have the equipment and training. Depending on what kind of restraint it is you might need heavy equipment to remove it if it's jammed. If it was just a seatbelt though that should be well within the park staff capabilities.
It should be the park that calls 911 if it's required though. Often times the PLC will refuse to open without an override which is something that maintenance is usually required to do (to keep normal ride ops from making critical mistakes).
A place to talk about roller coasters and parks that have them. Everyone is welcome here to both learn and to celebrate these magnificent machines designed to scare you.
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