In air cooled VW motors there are brass distributor drive gears. Freezing the part, the metal contracts allowing the gear to slip on verses being pressed if done quickly. Its actually in at least one manual (haynes if I recall) The metal is contracting on its self and the hole becomes larger. It never made sense offhand, but I never did the math either because it works. The same gear will need to be cut, or need a puller to come off. The tolerances there are much closer, but for a train, it may minimize the issue with the splines and even negate pressing the bearing into the frame. I realize the bearings might be bronze (?) and be affected differently (?) but its worth a try (for CW) considering the price of a bearing is so cheap. If it works out, try the gear next.
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