The LNER's classification system was the most helpful to railway enthusiasts. Each wheel arrangement was given a letter (e.g. A for 4-6-2, B for 4-6-0, etc.)
The LNER's classification system proved invaluable to railway hobbyists. Each locomotive's wheel configuration was designated with a unique letter (e.g. A for 4-6-2, B for 4-6-0, etc.).