Tay Bridge disaster warned of their unreliability, and declined to estimate conditions at Dundee from readings taken elsewhere. One modern interpretation of available information suggests winds were gusting to . Usage of the bridge was restricted to one train at a time by a signalling block system using a baton as a token. At 7:13 p.m. a train from the south (consisting of a 4-4-0 locomotive, its tender, five passenger carriages, and a luggage van (brake van) slowed to pick up the baton from the signal cabin at the south end of the bridge, then headed out onto the bridge, picking up speed.
Tay Bridge disaster he had never checked speed through the high girders. Painters who had worked on the bridge in mid-1879 said that it shook when a train was on it. When a train entered the southern high girders the bridge had shaken at the north end, both east-west and, more strongly, up-and-down. The shaking was worse when trains were going faster, which they did: 'when the Fife boat was nearly over and the train had only got to the south end of the bridge it was a hard drive'. A joiner who had worked on the bridge from May to October 1879