Hornby excelled themselves when they introduced the Gresley/Thompson surburban coaches. I've a number of these and have just recently finished weathering a Gresley brake and composite as well as a Thompson brake.
I used the T-Cut method of applying the cutting paste then wiping off with cotton buds gently buffing to a sheen. Then a watery wash of Valejo German/Grey/Dark Earth was allowed to partially dry before once more being wiped off with cotton buds.
The sides were then masked and the roof airbrushed with Tamiya Nato Black. The underframes were treated with a mixture of the later and NATO Brown to give a dusty work worn appearance. Buffer heads, axle box covers and bogies were picked out with Valejo Dark Rust and Games Workshop Gun Metal.
Here's the rake of 3 coaches accompanied with Kettering 15B's Ivatt 2MT 46401 and the ubiquitous horsebox (Parkside/LNER) on route to Cambridge/Newmarket respectively.
Also on a crimson theme I weathered an Hornby ex-LNER CCT and one of their ex-LMS horseboxes.Both nice models but the CCT suffers from the so called 'Design Clever' period in places.
And once more with 46401 in charge..
The T-Cut method of weathering the surburban coaches certainly helps give the paintwork a nice lustre.