The Far North Line was built in several stages through sparsely populated and undulating terrain. Extending to 161 miles (259 km), it runs north from Inverness to Wick and Thurso in Caithness, and currently carries a regular passenger train service. It was completed in 1874, running round the western margin of the firths north of Inverness and then keeping to the coast as far as Helmsdale. From that point it turns inland through Forsinard, returning to the far north-east coast at Wick and Thurso.