[Quick and.....um.....Dirty Weathering]

XP = Express Passenger.  A freight-carrying vehicle authorised to be included in express passenger trains and to run at (originally) 75mph though this speed was later reduced to 55mph IIRC.  

 

MT = Empty; shorthand for not conveying anything

 

 

[Quick and.....um.....Dirty Weathering]

As a powder weatherer myself I am rather impressed by the results on these wagons.  I too am curious as to exactly which pigment is being used.  I can (and sometimes do) wet my powders with water or hairspray which turns them momentarily into liquid pigment and allows me to add streak and fade effects.  I am also aware of weathering pigments available in the US but not in the UK (they cannot be shipped by air due to their content) though these are not Humbrol.

 

I have attempted to use Humbrol weathering powders but find them coarse and gritty so the remaining stock is confined to such things as ballast and ground-cover weathering which can be done as a wash.  Carrs powders went out of business quite some time ago so far as I am aware but if stocks are still available I should like to know of the supplier as they remain among the best I have used.  

[VERY off-topic! Why I've not been modelling for a while....]

Next time let me know you're coming!  You can sneak off and take in a layout or six while you're here