Throughout the 1970s and 1980s, BR undertook numerous schemes, including the electrification of the East Coast Main Line (ECML) and the ultimately-cancelled procurement of the Advanced Passenger Train (APT), (the latter being at one point intended to succeed the Class 87 as BR's next major intercity express train) that had led to a significant nationwide shortage of electric traction. Various different efforts were launched during this era to alleviate this shortage, including an electrified version of the Intercity 125 (known as the "HST-E"), the mixed-traffic locomotive, and what would become the Intercity 225.