I've recently returned to model railroading during the past 2 years & am building a British model railway. A lot of my locos & coaches are 30 to 40 years old, which I inherited. I've recently bought a few new items and have noticed that the wheels on some of my new coaches (in this case, two brand new Hornby carriages) are much finer than the older ones. These newer coaches often detail at switches or tight curves whereas the older ones do not (the older ones seem to have much more tolerance to cope with "deficiencies" in the track). My track is generally code 100 or similar track. My concern is this: Do most modern coaches & locos now have these fine-scale wheels and, if so, is this going to be an ongoing problem? I generally have fewer derailments or problems with my older Hornby and Hornby Dublo stuff while the newer items are more "tempermental". Any feedback or advice would be appreciated. Thanks! RobertInOntario.