(31 Dec 2013, 11:49 am)BJ10VUS wrote Yes, there is a point. The 'Diamond' services are one of GNEs more challenging routes and it is a chance for them to test the vehicles to see how they perform.
As another example...
"Citylink" service 58 could be perceived as a more challenging route than "Drifter" service 60, but to get an idea of how well the buses would cope with lots of uphills, downhills, and all the rest in between, a Streetlite Max was trialled on that service and look where those buses ended up at!