when they do this stuff, they don't just couple the coaches being transported to the train and have them run through the same track, do they? would they stand the speeds?
@kitten As far as this one knows, the carriages in front and behind have enough mass and bakes to compensate for the train being moved to not have its brakes active, and presumably higher speeds are fine when you don’t care about passenger comfort and take extra safety measures (like the extra brakes)