... someone who sees a reaction to someone being described as a narrow-gauge specialist as being a railfan, and whose first reaction is to think of the pro's and con's of having rails 2ft apart ...

... risks being a narrow gauge specialist in the broader sense, even if he comes down in favor of 4ft 8.5in.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.