Hi Chris,
Welcome aboard!! Yes indeed, fantasists is probably the best description. Such people pop-up on the radar fairly regularly, although the railway preservation/trainspotter fraternity seems to have a higher quotient than in most other areas of life - they walk amongst us!!
Anyway, you seem to have walked into a strange and bizarre world with this one, I hope that you can look back with a smile on your face with no visible scars to bear witness to rubbing up against these, er, 'strangers'!!
Cheers
Alan