Mallets (Articulated) with simple expansion
Locomotives
Baltimore & Ohio class EM-1
United States
Chesapeake & Ohio class H-7
United States
Chesapeake & Ohio class H-8 “Allegheny”
United States
Denver & Rio Grande Western classes L-131 and L-132
United States
Denver & Rio Grande Western class L-105
United States
Duluth, Missabe & Iron Range classes M-3 and M-4
United States
Ferrocarriles Nacionales No. 72
Colombia
Great Northern (US) classes R-1 and R-2
United States
Norfolk & Western class A
United States
Northern Pacific classes Z-6 to Z-8
United States
Pittsburgh & West Virginia classes J-1 and J-2
United States
Seaboard Air Line classes R-1 and R-2
United States
South African class ME
South Africa
Southern Pacific class AC-9
United States
Southern Pacific classes AC-4, AC-5 and AC-6
United States
Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12
United States
Southern Railway (USA) class Ls-2
United States
Uintah Railway No. 50 and 51
United States
Union Pacific class 3900 “Challenger”
United States
Union Pacific class 4000 “Big Boy”
United States
Virginian class AG “Blue Ridge”
United States
Western Maryland class M-2
United States
Western Pacific class M-137
United States
