tyson,
Where the speed of light is so much faster than the speed of sound, I always end up overlooking my language.
I have one, so far unbroken rule.............never build a working lift bridge on a portable module....it'll "work" in transit, and there won't be much left of the module!
On my new HO modules, I have a rolling lift that serves my narrow gauge. If I can make the lift section removable, I might break my rule, but only because I'm the only one using the narrow gauge, and can stop my train before the bridge opens. Hehehehe
On the other hand..............
Pete