1976 the Federal Assembly approved an additional federal contribution of 39.7 million. As the centrepiece of the third stage, runway 14/32 was opened on 1 April 1976, increasing capacity by a third. In the early days, the new runway served exclusively for landing traffic. The rail link, which had been approved by parliament in 1975 in a separate federal decree, was still outstanding. As this was a project of the Swiss Federal Railways (SBB), the cost allocation differed greatly. Of the total costs of 285 million, the SBB contributed 60%, the Federation 33% and the canton of Zürich 7%. The project comprised the Zürich Flughafen railway station under Terminal B (on which construction had been underway since 1971) and a new line between Bassersdorf and Glattbrugg. After nine years of construction, the ceremonial opening of the airport line took place on 29 May 1980. Fourth stage of construction In the second half of the 1970s, the volume of traffic continued to rise sharply, so the canton of Zürich, the FIG and Swissair worked out a project for the fourth construction phase. On 28 September 1980, with 142,240 to 104,775 votes (57.6%), Zürich voters accepted a loan of CHF 48 million for civil engineering works, which were part of the forthcoming construction work. Also in 1980, the Federal Office of Civil Aviation published a new airport concept, which replaced that of 1945. The focus was now on qualitative expansion, taking into account spatial planning and environmental protection considerations. Based on this concept, the Federal Assembly approved the "Building Programme 1981-1985". This programme provided for investments of CHF 393.3 million in Zürich-Kloten, but the subsidy contribution of 10.3% was significantly lower than for the Geneva and Basel-Mulhouse airports. This was justified by the catch-up demand of the two other major Swiss airports. The central element of the fourth stage was the finger dock in Terminal A with 13 docking positions. Also planned were a new control tower, a baggage sorting system, an additional multi-storey car park, waiting rooms and an operations centre for aircraft crews. Later, Zürich's cantonal government also decided to renew the damaged western runway, which had to be closed for two and a half months in the summer of 1985 for this purpose. Fingerdock A was put into operation on 1 November 1985, the new 41 m high control tower on 29 April 1986. There were also plans to