includes an infrastructure system of roads, highways, freeways, airports, ferries, pipelines, trails, waterways and railway systems serving a population of approximately 1,003,299 (according to 2007 estimates) inhabitants year-round. It is funded primarily with local and federal government funds. The Saskatchewan Department of Highways and Transportation estimates 80% of traffic is carried on the 5,031-kilometre principal system of highways. The Ministry of Highways and Infrastructure operates over of highways and divided highways. There are also municipal roads which comprise different surfaces. Asphalt concrete pavements comprise almost , granular pavement almost , non structural or thin membrane surface TMS are close to and finally gravel highways make up over through the province. In the northern sector, ice roads which can only be navigated in the winter months comprise another approximately of travel. Saskatchewan has over of roads and highways, the highest length of road surface of any Canadian province. The major highways in Saskatchewan are the Trans Canada expressway, Yellowhead Highway northern Trans Canada route, Louis Riel Trail, CanAm Highway, Red Coat Trail, Northern Woods and Water route, and Saskota travel route. The first Canadian transcontinental railway was constructed by the Canadian Pacific Railway (CPR) between 1881 and 1885. After the great east–west transcontinental railway was built, north–south connector branch lines were established. The 1920s saw the largest rise in rail line track as the CPR and Canadian National Railway (CNR) fell into competition to provide rail service within ten kilometres. In the 1960s there were applications for abandonment of branch lines. Today the only two passenger rail services in the province are The Canadian and Winnipeg–Churchill train, both operated by Via Rail. The Canadian is a transcontinental service linking Toronto with Vancouver. The main Saskatchewan waterways are the North Saskatchewan River or South Saskatchewan River routes. In total, there are 3,050 bridges maintained by the Department of Highways in Saskatchewan. There are currently twelve ferry services operating in the province, all under the jurisdiction of the Department of Highways. The Saskatoon Airport was initially established as part of the Royal Canadian Air Force training program during World War II. It was renamed the John G. Diefenbaker Airport in 1993. Roland J. Groome Airfield is the official designation for the Regina International Airport as of 2005; the airport was established in 1930. Airlines offering service to Saskatchewan are Air Canada, WestJet Airlines, Delta Air Lines, Transwest Air, Sunwing Airlines, Norcanair Airlines, La