hi all, i have the Hornby devon bell train pack and having issues with the pullman coaches. Out of all my rolling stock (i have Hornby mk3 coaches, maunsell coaches, Bachmann, Hornby and Dapol wagos) the 3 coaches from this pack are having issues on certain parts of the layout, it happens 1 in 5 times on certain sections of track, speed does seem to play a part. it looks like the wheels are riding up the rails and causing derailments, one section is a small straight section. the track appears flat and straight, even my Dapol wagons roll over it fine which is usually my benchmark for well laid track.
i don't know if its drag caused by the metals wipes over the axle or something that's causing tension on the bogies, before i go and rip up track and ballast are there deeper flanged wheels i could try?
thanks