The network takes on more than a thousand new staff, with applicants including would-be driver 54-year-old Danuta, who needs to get a grip on the details of signals and points, as well as the finer aspects of engine technology. Alice is hoping to be a customer service assistant, but first she must undergo an intensive five-week training course, while Naeem is halfway through his six-month probationary period and is working at the busy Bank station. In Dartford, a disaster training scenario unfolds as 2,000 staff cope with the simulated collapse of a tower block onto Waterloo station.