This was my post on UKTs it will give you some idea of braking values;
Personally have not DECIDED Whether to buy it or not yet. Regarding braking a train has to be able come to a complete halt within a set distance from a set speed, I would presume thatthis is now in the group standards, and the 2.5 miles at full strength is Certainly too long. An HST is capable of stopping in 1,930 yds from 125 MPH, a loco hauled Comparable formation takes 2,220 yds from 100 mph .According to the brake trials held in the early days. The HST at 125 which designed to at least meet the performance of a loco hauled train from 100 mph and comfortably exceeded it (Uusally, I am sure there are other drivers on here who have Suffered The Odd weak set). Of course the anti slip Could thus lengthen the braking distance, but the conditioning blocks on the power cars had a cleaning effect on the rail, I suspect These Are not present on a Voyager. Presumably the Voyager must at least be capable of stopping from 125 mph within 2,220 yards, I would like to think less with modern braking systems, Especially as allowance has to be made for anti-slip. Incidentally this thing on wet or dry rail. Have not driven the voyager for quite a while so I can not remember what the brakes are like myself, not seeking a fan of Drastic Plastic.
1 yard = 0.9144 metre