The "Gresley Pacific" refers to a class of steam locomotives designed by Sir Nigel Gresley for the London and North Eastern Railway (LNER) in the 1920s. These locomotives were known for their distinctive streamlined design and powerful performance, primarily used for express passenger services. The most famous member of this class is the Flying Scotsman, which became an iconic symbol of British rail travel. The Gresley Pacific locomotives typically featured a 4-6-2 wheel arrangement, which provided a good balance of speed and stability. They were built to handle long-distance routes, contributing to the efficiency of rail transport in the UK. Their legacy continues to be celebrated by railway enthusiasts and historians alike.