That is a MCBR where the LSMs are also used as brakes should a train need to be stopped there.
Here is an image of Bluefire's MCBR.
Notice the LSMs. They need to be energized in order for a train to pass through. If there were to be a condition where the train needed to stop in the MCBR (IE: Fault, E-stop etc...) the LSMs will provide braking force. That's exactly why they are considered "fail-safe." They don't need power to stop a train. Maverick's lift hill and launch work the exact same way as well as Wicked's launch/tower section.
This video shows Maverick's LSMs being used as brakes.