Check out these fascinating Hughes 4-6-0 and 4-4-2 locomotive concepts.
Inspired by the iconic Crab, the Hughes Atlantic and 4-6-0 would have been a groundbreaking addition to the railway world. If Hughes had chosen to pursue this design, these locomotives might have been constructed before his retirement in 1926. I believe Hughes had a Pacific design in mind, although it never materialized.
Unfortunately, the LMS faced a setback because of the "small engine policy," delaying the introduction of larger engines until the Royal Scot, engineered by Fowler, came into existence in 1927. Imagine the possibilities if these imaginative Hughes locomotives had seen the light of day!