Alarmed that the temperature could rise above twenty degrees, last Friday evening, Network Rail announced that on Saturday there would be a speed restriction of 20mph all the way from Queen's Park to Bushey. After all, the rails might buckle in the oven-like temperatures.
Problem is: management didn't bother amending Bakerloo running times at all. Somehow, they expected trains to run to time without being allowed to run to time.
Drivers knew that this would rapidly turn into a fiasco. And so it came to pass. By Saturday midday, the job was up the wall.