Track weathering

Muddy/dirty tracks:

- Paint the same earth tone you inteand to weather the hull and road wheels
- Lightly drybrush the contact points with the ground and roadwheels gun metal
- Lightly drybrush with silver or burnish with pencil lead..

Here's the method that I use ... though there are many different ones too.

1. Tracks with rubber shoes
- paint the entire track black
- paint the end connectors and guide teeth with gunmetal
- dry brush the metal parts with rust
- drybrush the metal parts with steel
- burnish the metal parts with pencil lead
- dust with pastels chalks

2. Steel Tracks
- paint the entire track gunmetal
- dry brush with rust
- drybrush with steel
- burnish with pencil lead
- dust with pastels chalks

Hope this helps a bit.