The template was from the previous 4-4-2 and 4-6-0 wheel arrangements ... How valued were these locomotives? It's estimated in Alfred W. Bruce's The Steam Locomotive in America that 6,800 Pacifics ...

Combining the compound system with the introduction of superheaters made the Mallet of any size and wheel ... 4-6-6-4 No. 3985 and Big Boy 4-8-8-4 No. 4014. To find articulated steam locomotives ...