Recently built a pair of FNA nuclear flask wagons and for a first attempt am not displeased - however the bogies didn't seem to be right, they fouled the chassis when turning and caused derailments. So I obtained some bogies from a Bachmann JGA hopper (the same pattern). The problem is now that the Bachmann couplings are insufficiently long and cause buffer lock. Is anyone aware of an NEM pocket compatible coupling with a longer length than the standard Bachmann unit? 3-4mm longer would probably be more than enough.