Thanks, George. I do have a battery-powered luggage scale, and it goes about its job with digital assurance. No quirky traits or fond memories attached to it, though. My "Way Scale" sits on the corner of my workbench, and its 25-lb limit works for mist of my tasks in the shop.
(I do occasionally wrap a strap around Freddie's top tube if I want to measure "dry and "loaded" weights. For that, the digital scale works well.)
I've used Amtrak only once with my bike, on the return to upstate NY from Everett, WA, after my 2016 tour through the Rockies & the Pacific NW. Amtrak was very helpful & accommodating: I used two trains, one to Chicago and a second to Utica. I don't recall any concerns about weight, and Amtrak provided the box. One momentary panic when I reached Utica: they couldn't find my bike! Seems it had been put onto the part of the train that, at Albany, would go to Boston rather than NYC. Happily, the fellow in charge of the luggage van was able to locate it for me.
We regularly use Amtrak from Utica to Manhattan & return to visit friends in NYC. It's an easy 3 hours' drive from Ottawa (at least, it has been so in the past...) and parking is free. Makes for an 8 or 9-hour journey to NYC.
Cheers, John