Back at the GWR railcar, the trailing bogie is a pretty simple, if fiddly, construction job.
The biggest problem is that if assembled as supplied, the axle ends are nowhere near being held by the holes behind the axle boxes. Filling these with brass bearings didn't help, they were too small for the holes.
A set of Peco nylon bearings did the job. These could be pushed in to the holes with some parallel jaw pliers using an old lolly stick to protect the casting. Left slightly proud of the sides, they held the axle points perfectly. The bogie now rolls with no resistance along the track.
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