RfD not really a popular choice and a surprising one for the first run. 375 was done by Heljan some years ago and when Bachmann brought out their 365 that was a slow seller too.
Kernow`s 306 has been around unsold for some time too.
I bought 47004 in Constuction but that was only an impulse buy.
What would have sold is Original Railfright like they brought out 47018 in 2mm , hopefully that might make batch 2.