sentences:  The main line to Aalbæk was never constructed however, but the branch line to Hirtshals was built instead.Construction started in April 1924, and the railway was opened on 18 December the following year.From the start, the railway line was operated together with the Hjørring-Løkken-Aabybro Line and the Hjørring-Hørby Line in the joint operating company Hjørring Privatbaner (HP).