I can't say much about today, but I do recall that for the majority of WWII, British tank designers were restricted to only the width that could be carried on British trains. Later in the war this restriction was dropped and some really good designs were finally able to see the light of day.
Modern tanks may not be as easily transportable by rail as one may wish. Tunnels constructed in the 19th and early 20th centuries as well as bridges are going to present serious hurdles for transportation which in some cases may force delays of hours, days or even weeks if an alternate route can't be found/used.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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