The SAAL-corridor (Schiphol - Amsterdam - Almere - Lelystad) is one of the busiest rail corridors of the Netherlands. The rapid expansion of Schiphol airport, Zuidas Amsterdam and Almere city will cause a significant increase in the number of trains on this corridor the coming years. For the Amsterdam part of this line, this means that the number of tracks needs to be doubled, from two to four tracks. This will have to be realized in an urban environment, with all the challenges that this brings with regard to existing buildings, traffic and the limited available area.
The integrated design of the required infrastructure expansion including the expansion of Amsterdam RAI and Duivendrecht station was taken on by Royal HaskoningDHV in collaboration with Movares. We also drafted the (Design) Routing Decision for the part of the line between Hoofddorp and Diemen.
A possible bottleneck in the project was the predicted time and effort that would be required for the integrated design of 8 km doubled track, 13 bridges and viaducts and several kilometres of noise reduction measures. Therefore, it was essential that the design process would be done in the most efficient and purposeful way possible. Due to the limited project lead time it was necessary at the start to make a quick and responsible decision to choose a Preferred Alternative design that could then be worked out to the correct detail level in the Design Routing Decision phase.
The design challenge was to expand the existing rail infrastructure and its capacity, but in the most cost effective, sustainable and socially acceptable way possible, in this limited and environmental sensitive area.
Royal HaskoningDHV and Movares have produced the Preliminary design, Final design and the specifications for the tenders, and also the (Design) Route decision for the route section Hoofddorp - Diemen. This comprised of the following aspects:
- Functional analysis and design of the whole rail system
- Calculation of passenger carrying capacity, and timetables
- Design of the substructure and tracks, train safety management system and the electrification system
- Design of the constructions such as bridges and viaducts
- Modification of the railway stations Amsterdam RAI and Duivendrecht.
- A number of investigations were carried out for the benefit of the Design Route Decision, these were researches into the possible effects of noise, vibrations, air pollution, and how best to integrate with the existing ecology and landscape.