NB The illustrations of rolling stock started life as pencil sketches, prepared so I could build models whilst travelling without carrying heavy books. The body detail is about right but the chassis detail is pretty rough as I use RTR or (more commonly) Peco chassis to build the (N Gauge) models. The sketches were later re-drawn using a computer (and version 2 of 'PC Paintbrush') so I could pass them on to the lad to have a go himself, but the chassis detail remains approximate and they are certainly NOT scale drawings. The coloured illustrations were prepared when the web site was set up and these are simply tinted versions of the original sketches, I have tried to 'sample' colours from photographs but they are very much an approximation of the prototype. For more accurate and detailed drawings you really need the books listed in the bibliography. If you are hard up you can request books from your local library using the inter-library loan service (which has turned up some really obscure and useful books for my own research), many societies and clubs also maintain libraries of books donated by members.