I actually used a Lima Class 31 chassis in my A class. I bought the chassis new on eBay. Maybe I was lucky, but it runs smooth and slow, all be it a little on the noisy side. The advantage of using the class 31 is that the bogies are 'similar' to the ones on an A class, so I left them unaltered and didn't attach the Silverfox bogies. When I say similar, they are not identical, but I like them. They are also longer than the bogies Silverfox supplies. I have never posted photos on here, but I can try if you are interested to see how they look......