Booster?

On the Alpha. i see you can add a Booster track. Is there a way to adjust the speed or has that not been added yet?

Just wondering if I'm missing something. Wanting to make a coaster without a lift hill.
 
Have a feeling the boosters are not currently working. Tried them on a coaster earlier and they did nothing, just made a noise when the coaster car went over them.
 
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