A staff absence means the pressure is on for Jackie as she tackles her biggest ever tour, whilst a gaming competition on the concourse causes staff to get competitive.In the tunnels beneath Central, the engineers tackle complex steel repairs, and the closed lines allows Paul to explore the history of some of Glasgow's forgotten stations. Outside of the station, the team at Polmadie depot work against the clock to get the iconic Caledonian Sleeper back on for its nightly service.