old vs new
Bizer & Pineneedles - The two outgoing Enterprise engines were direct drive; no gearboxes. To reverse direction, the engines were stopped, then restarted with the opposite rotation. The two new Cats do have gearboxes, so may be kept running and shifted much like an ordinary boat would. There will still be a delay in shifting to allow the propellors to stop rotating first. This will be shorter, since the new equipment will also include shaft brakes.
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