S1 • E5 May 5, 2026 43m
Chris and Francis are keen to make up the time lost to damaged wheels but it won't be easy. Assembling a 12-tonne bogie and fixing a leak in the braking system are not jobs to rush, but the clock is ticking. The technical minds of Francis and Isla are used to calculate the air volume to pressure ratio of permissible air loss in the braking system of the train.
