I downloaded the above pack as it looks very good and with the extended Chatham Mainline to Ramsgate and Dover I though it would be a good run. However - The stock is reskins of the Matrix Trains Pullman Cars which are Vacuum Only and if you have an Air Braked loco on the front you won't be stopping anytime soon. The coach .bin files need updating with an Air Brake entry to make them Dual Braked Peter
You could adapt the braking specs from another dual braked coach. But I guess these coaches were vac braked only so this would be realistic then?
The Real coaches run today as the British Belmond Pullman with either a Class 67 or a Steam loco pulling them. https://en.wikipedia.org/wiki/Belmond_British_Pullman As built they only had Vacuum Brakes but when they were purchased and refurbished for VSOE work they were fitted with Air Brakes and Electric Heating. I copied the TrainBrake info from a Kuju Dual Braked Coach in to each of the bin files for this repaint. Peter