The UCC maintains full communion with other mainline Protestant denominations. Villa Park is within a short distance of two mainline railway stations. Several Mainline Protestant denominations are headquartered in the city. Suburban trains run along the mainline between London and Woking. It was the first North American railway to use diesels in mainline service. There are more than of operating mainline railway in Alberta. Evangelicals are often defined in opposition to Mainline Protestants. One of the most prominent mainline Protestant jurisdictions is the Episcopal Diocese of Pennsylvania. Basters from Mainline churches are mostly Calvinist. Tulsa is also home to a number of vibrant Mainline Protestant congregations. This gap has caused feelings of alienation among conservative mainline Protestants. The track gauge adopted by the mainline railways is . The majority of broadly Christian and mainline churches do not subscribe to pretribulational views. About half of mainline Protestants describe themselves as liberal. The city is located on the former mainline of the Pennsylvania Railroad.