And on we go! Next step, a proper dirt skin. Normally (and especially with freighttrains) I weather them quite heavily. Locomotives at the end of their lifespan should look absolutely used up. But in this case, the Karlex being one of the "showhorses" of the DR, it never looked absolutely nackered (only for some after the reunion). So, in my opinion, the aging should be a bit softer and lighter then usual. But still, it has to look like it has seen plenty of service and years. This is what I came up with (GIF):
The colors will fade over the years and dirt will gradually cover up the locomotive - especially at windows, vents, stacks and raingunnels - and corrosion in some places. Now, at least as far as I'm concerned, it looks properly
used and has an aged feel to it.