from what i've seen, the hughes locos were for goods work, and you also have to remember how much bigger a pacific or larger engine is compared to the infrastructure the lms had to work with
i mean a 0-6-0 tank engine that doesn't look like it's from any company could work
Edit: or pull a Hornby and make a 2-4-0 or 0-4-2 chassis that can take multiple basic body shells