SOME of the brightest and best minds in heavy-haul railway engineering gathered in Delhi last week for the 10th International Heavy Haul Association (IHHA) conference. And while many will return when the organisation next convenes in Perth, Australia, in 2015, a great number of the leading lights in the industry are gradually taking their leave. Indeed there is a strong chance they will be found enjoying Perth's beaches as part of their retirement in two years time rather than discussing the intricacies of the wheel-rail interface at the city's convention centre.