In the 1970s we had generic bogie coaches from Tri-ang/Hornby and Farish, now we have loads of accurate models of many types. Maybe in 40 years we'll have accurate models of 4 and 6 wheel coaches of all the pre-grouping companies. Until then these generic models will have to do. The alternative is either nothing, build kits or scratchbuild. For many the appeal of these models is the finish rather than their shape, not many modellers can match that on these models.