In between all my gallivanting around, getting locked in car parks and eating cake, I managed to find a few minutes to take the railbus to the spraybooth for a blow over with some colour.
To make accessing the lower portions easier, the model sits on a handy box of cat food. The moggies don't seem to mind me using it and the recycling men don't seem bothered what paint it gets in the outside. It makes a nice solid support and yet can be spun around on the turntable.
Colours used were Humbrol 250 (pale brown) below the footplate, 70 (rust) everywhere but especially the front, 173 (track colour) all over and a finish using Railmatch weathered black around the exhaust.
The effect I'm looking for is a gentle tinting rather than any standout colours. Each paint is heavily thinned and sprayed from about a foot away so it's nearly dry when it hits the model - dirt is matt as far as I am concerned. To avoid clean "shadows" behind the rods, a 9V battery turns the wheels a bit between colours.