Heres one of a scrap line class 47 I did for a member of this forum ~
![Image](http://i121.photobucket.com/albums/o240/ZunnanDeclawed/Railway%20Modelling/IMG_3895.jpg)
It uses several techniques, including the use of salt to create the paint blisters on the cab roof, dry brushing, grime washes and paint fading to create a very patchy finish based on a class 47 that was dumped in a local scrap line for almost a decade.
A more basic weathering job on a kit built van~
![Image](http://i121.photobucket.com/albums/o240/ZunnanDeclawed/Railway%20Modelling/IMG_1280.jpg)
The van was built from a Parkside kit and initially painted with a base coat that was a mix of grey and brown (I forget which was used) to represent unpainted wood. A few bodyside planks were selected and scratched to produce a wood grain and then masked before the normal BR Bauxite livery was applied over the top. Then it was just given a light dirt wash and the body framework and chassis dry brushed to pick out some of the detail.