The 1970s saw British Rail successfully introduce high speed diesel train services, as well as major resignalling projects designed to increase operational efficiency. In 1976, the InterCity 125 High Speed Train (HST) was introduced on some services and the InterCity brand was adopted. This created an increase in passengers using the railways and improved British Rail's finances. British Rail also started development of the world's first tilting train – the Advanced Passenger Train (APT). However, lack of money, political pressure and the launch of the prototype into passenger service before technical problems were fully overcome led to the project being cancelled in the early 1980s.