Where did you get your info about train production? I would be interested how the figures vary from country to country.
But then there is some local knowledge to add, like the fact that pretty much all factories left are just tweakers for the internal market (narrow-gauging and so on), afaik the only one with significant production and occasional export is Bombardier in Derby - which got very close to shutting down around year 2000 and is basically run from Berlin anyway. Most European factories, despite some consolidation after the EU common market reached full gear, still pump out trains sold around the world - and then you have Japan and China that play on a different level.
Afaik the best trains in the UK are all bought from abroad at the moment. Things might change with the HS2 (high-speed) project that should be tendered out this year [1], but note how the main candidates are basically just reselling Japanese tech.