David replied to me:
As Johannes pointed out, it is a bad idea to tow a train of contragrav-only
carriages by a single contragrav-and-thrust engine in front.
Why? Point it the direction you're going, and go. Don't get in its
way, or bad things happen. Suits a train pretty well! Would be
suited for empty worlds where there's bulk cargo to move long
distances.
The only way to brake would be to let it coast to a stop from air
resistance. Trains may be unable to dodge, but at least they have brakes.
Regards,
Onno
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