A trip to the National Railway Museum in York always produces a frisson but last month was special. Coinciding with the jubilee celebrations was Railfest 2012, billed as Britain’s biggest ever gathering of rail record breakers. Historic locomotives large and small awaited informed homage from the nation’s trainspotters.⇑ Yes, we were all wearing anoraks (in fairness, it was an outdoor exhibition) and yes, sales of dry white wine were outstripped by a beer called Flying Scotsman, but the crowds …