 Complete the following phrase:  The route through Kings Cross Metropolitan remained busy throughout the remainder of the nineteenth century, with trains from five companiesthe Metropolitan, GNR, Midland, LCDR and the South Eastern Railway SERand routes including Victoria to Peterborough as well as services from north London to Chatham and Dover. A service operated from Liverpool to Paris via the Widened Lines, departing at 08:00 and arriving in Paris by 22:50, having travelled by across the English Channel in a paddle steamer. Trains continued to ascend up the Hotel Curve from the Metropolitan station and reverse into the mainline station until 1878, when a new platform was built on the western side of the GNR tracks. This became known as the Kings Cross Suburban station, but suffered from several problems including a steep incline and sharp curve, along with a build-up of smoke because of its proximity to the mouth of the tunnel. Congestion was somewhat alleviated when a connection between Finsbury Park and Canonbury allowed use of the North London Railway tracks to take some of the traffic from the GNR lines into 