Bought 6 and all have a bogie which squeaks - I think there's an issue with the bearings. Might be cured with a bit of oil. There also appears to be an issue with the couplings - some derailments on the straight as well as curves (which on my layout are 36" - don't know how others will fair on standard 2nd radius curves!). Again needs investigation. I have managed to get them to run but only slowly, and by switching them around in the rake.