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This OO gauge model includes a combined brake system, but is also available with either a single brake or two independent brakes. For more details on the different brake configurations see this discussion.
The wagon can be painted using most common modelling paints (I use a mixture of Humbrol and Tamiya acrylics) and a range of appropriate detailing transfers are available from Modelmaster.
To complete the wagon you will need to add wheels and couplings. The wagon was designed to take 12.6mm wheels from Hornby, specifically R8098. The model includes NEM pockets so you are free to choose your favourite NEM compatible couplings, personally I use the R8219 couplings from Hornby.