ordering new trains. A key campaign promise of the Andrews government prior to its election in 2014 was to remove 50 level crossings in 8 years, the most intensive such program in Melbourne's history. Because of Melbourne's generally level topography, the suburban rail network was constructed with a large number of level crossings. By 2014, over 170 remained, due to a lack of funding for grade separations after 1918. The Government's Level Crossing Removal Project became a resounding political success, despite concerns it was creating poor value-for-money infrastructure and controversy about the selection of elevated rail as a method for removing some crossings. By 2018, 29 level crossings had been fully grade separated, well ahead of the government's original schedule, and a further 25 crossings were added to the program to be completed by 2025. The project includes rebuilding or upgrading 27 train stations, such as Bentleigh and Clayton railway stations, or laying new track, such as the duplication of 1.2 km of single track railway between Heidelberg and the rebuilt Rosanna stations. Large sections of elevated rail have been built on the Pakenham and Cranbourne lines, and further sections are planned for the Mernda and Upfield lines, including a 4 km section on the Mernda line in Preston. The Regional Rail Link project, which created a new Deer Park–West Werribee railway line in the city's west with new stations at Wyndham Vale and Tarneit, as well as adding an additional track pair between Sunshine and Southern Cross, was completed in mid-2015. Although the project was intended to provide segregated routes for regional trains to Geelong, Ballarat and Bendigo, rapid population growth in areas served by the new line forced these services to perform the role of an outer suburban network, causing significant delays and overcrowding. A redesigned network map was released by PTV at the end of 2016, which replaced an emphasis on fare zones with delineation of individual lines and service patterns. The new map also incorporated regional services and was designed to be accessible to passengers with the most common types of colour blindness. Metro's contract to operate the suburban network was renewed in 2017 for a further 7 years. The renegotiated contracts included higher monthly performance targets, which it failed to meet 6 times in the first year of the contract's operation. Construction of an extension of the South Morang line to Mernda commenced in 2016