I'm currently part way through 'The chronicle of Boulton's siding', about Mr Issac Watt Boulton and his fleet of bizarre looking locomotives available for hire by railways and engineering contractors.  It's turning in to one of those books I wished I'd read years ago, and is well worth tracking a copy down if you'e not read it.    Sadly, given the date the book was originally written, there aren't many photos of the locos. A spot of googling turned up photos of Rattlesnake and Ariadne. Does an