arched bridge on the route, with the tram tracks placed centrally in the road. Because trolleybuses were not constrained by tracks, double-deck vehicles would have collided with the bridge if they did not use the centre of the road. At the opening ceremony for the new route, the chairman of the Tramways Committee was able to report that the fortunes of the Wednesfield line had been turned around, and it was now a profitable route, whereas the tramway had made a loss. The Corporation rectified their lack of formal operating powers for the trolleybuses when they obtained the Wolverhampton Corporation Act (1925), which gave them powers to build and run trolleybus routes within the borough and outside it, as well as giving them powers to take over tram routes which were operated by the Wolverhampton District Electric Tramways Company. The tram routes served Dudley, Bilston and Willenhall, and the intention was to replace the trams with trolleybuses. The conversion work took place in stages, with the first part from Snow Hill to the Fighting Cocks public house on the borough boundary opening on 26 October 1925. This was extended to Sedgley Bull Ring on 10 November 1925, and then to Sedgley Depot on 11 May 1927. Shortly afterwards, the changeover was complete, when the service reached Dudley on 8 July 1927. The initial vehicle, which carried civic officials from Coseley, Dudley, Sedgley, Willenhall and Wolverhampton, was one of a batch of 3-axle double-deck trolleybuses manufactured by Guy Motors of Wolverhampton. They had produced their first such vehicle in 1926, which had 61 seats and a covered top but an open staircase at the rear. Wolverhampton ordered a further 58 similar vehicles from Guy Motors over the next five years, although they all had an enclosed rear staircase. Expansion of the network continued through 1927, with trolleybuses reaching Neachells Lane, Willenhall on 15 May. This route was extended to Willenhall Market Place on 16 September, as there were plans for through running onto the Walsall system. A route to Penn Fields opened on 11 July, and another to Tettenhall on 29 October. The last trams ran in August 1928, which allowed the route to Bilston to be opened on 19 November 1928, and this was extended on 28 May 1929 to reach Darlaston. It was at this point that the system became the largest in the world, with around of route,