it is the latter hornby 2 rail version from around the 1970's i'd guess they were completely new toolings as the 3 rail stuff were cast metal and the two rail are plastic bodiesThat looks like the original Hornby Dublo "Sir Nigel Gresley" that I remember from my 11th or 12th birthday. Circa '49='50? Except for the 2 rail, mine was 3 rail.
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