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2-3-1 or 4-6-2 if you're an 'merimutt. Interestingly enough, while widespread in whole of Europe, my country's railway acquired a vast amount of 1-4-1 locomotives for express services (PKP classes Pt31 and Pt47), with only two Pacifics ever built in the country. The remainder consisted of captured German locomotives of class 03 (pic related as PKP Pm2).
