Steam traffic began to be replaced in the late 1950s. Between 1959 and 1961, suburban services switched to diesel multiple units, while the last regular long-distance steam train left Paddington on 11 June 1965. The track layout was reorganised in 1967, abolishing the distinction between arrival and departure platforms that had been a feature of Paddington since opening. A new set of sidings was built south of Royal Oak, and the track curve into Paddington was eased. Services to the Midlands were rerouted via during this time. The station concourse was enlarged in 1970, and the ticket office was rebuilt in the same year. By this time, public opinion had turned against wholesale demolition and redevelopment of stations such as Euston, and consequently the rebuilding work was done with an eye towards preserving Brunel and Wyatt's original station design. Special steam services began to be run from Paddington again in the 1980s.