Some progress has been made:
The loco part is now complete. She was given two coats of acrylic paint. Once dried the model was given a coat of matt varnish
Now the fun starts. The exterior was given a few coats of dark dirt weathering wash. In between the wash coats any excess was cleaned off.
Then certain areas were washed / highlighted with a gloss oil stain wash.
Finally the interior was washed with a light dirt, to show off any detail
Tim