Minecarts seem to ignore unpowered rail instead of braking, and they don't start moving when you power a rail going into a block.
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I was definitely using powered rail. I was testing a hopper minecart unloader, and it seemed to totally ignore the braking effect and would not start moving at the dead end when I powered the rail.
Those are activator rails. Powered rails are gold.
Are you sure that it's a powered rail, and not an activator rail?