I have just purchased Bachmanns V2 LNER 'Colstreamer'. I noticed that the rear pony truck was not horizontal with the track. I compared it with the more recent BR 'Green Arrow' version of the model and this looked O.K
Further examination revealed that the wheel diameter on the Coldstreamer was larger causing the pony truck to adopt a slight up angle.
Which is correct here. Have the wheel diameters changed on the model or did the prototype have different wheel diameters? I can find no info on this