...The next question would be 'what new minimum radius standard'?. In OO I believe that circa 30" / 750mm radius 'does the job' in the sense that models of the largest subjects can be externally correct, with a 24" / 600mm radius allowing the majority of UK subjects to run. Will any outfit punting its money on RTR OO ever be brave enough?
'Talking to myself', I know; but now in possession of the new Bachmann V2, and they have specified 24" minimum radius as a requirement if replacing the flangeless rear truck wheelset and fitting the supplied flanged wheelset in the rear truck,
if the loco is going to be operated in this condition. That's a positive step forward in my opinion, identifying a minimum radius requirement other than 'R2', for the 'alternative state' that the model offers.
Not having purchased every RTR OO model from the range currently available, I don't know if such a requirement has been attached to any other product. Anyone?
Hornby, which initiated the flangeless rear truck wheelset on its pacific models from 2004, has supplied a replacement flanged wheelset for those that want to install it [good], but with no guidance on 'consequences' [not so good] simply stating 'for display' [which I read as = 'not intended for operation']. On the Gresley pacifics, the consequences are circa 60" minimum radius, and on the Britannia 'doesn't fit'[!] as the flanges foul on the interior of the cast rear truck frames. The happy carver [me] found that on the Gresley pacifics removing material inside the rear truck enabled a 30" minimum radius, and on the Britannias cutting clearance sufficent for the flanges not to foul the casting was good for 30" minimum radius; in all cases the work is invisible with the model reassembled which is neat. CAVEAT: all these models were purchased relatively early after first release, quite possible that subsequent reissues and the newly retooled A3 will differ in some respects.