The locomotives were designed to cope with the heaviest passenger trains in the post-war period on the East Coast Main Line (London – York – Newcastle – Edinburgh – Aberdeen) which consisted normally of trains with up to 15 coaches and up to 550 tons. The Peppercorn A1s were able to pull such a train on the flat at a speed of 60–70 mph (95-110 km/h). Like previous LNER pacifics, the class had a 3-cylinder arrangement. The chimney system was of the type Double-Kylchap.

Description: Sprite by CT | Name: Paladar Maxisys | Age: 293 || Species: Human-Drakii Mix || Gender: Male || Class: Assassin || Sub-class: Shadow Dancer || Attack: 483 Defense: 527 Heath: 839 Magic Skill: 198.5 Speed: 600 Perception: 582 Alchemy: 94.3 Luck: 100 Stealth: 258.75 Weakness: Unidentified || Fighting Styles: Yautja, Assassin, Shadow Dancer, Guerrilla Warfare, Jujutsu, Ninjutsu.