Locomotives with 2-Wheel Leading Trucks Switchers
2-4-0 4-Coupled 0-4-0 4 - Wheel Switcher
2-4-2 Columbia 0-6-0 6  - Wheel Switcher
2-6-0 Mogul 0-8-0 8 - Wheel Switcher
2-6-2 Prairie 0-10-0 10 - Wheel Switcher
2-8-0 Consolidation  
2-8-2 Mikado

Articulated Locomotives
2-8-4 Berkshire 0-6-6-0  
2-10-0 Decapod 2-6-6-2  
2-10-2 Sante Fe 0-8-8-0  
2-10-4 Texas 2-8-8-0  
  2-8-8-2  

Locomotives with 4-Wheel Leading Trucks

 2-6-6-6 Allegheny
4-4-0 American 8-Wheel 4-6-6-4 Challenger
4-4-2 Atlantic 4-8-8-4 Big Boy
4-6-0 10 - Wheel  
4-6-2 Pacific Tank Locomotives
4-6-4 Hudson 0-4-0 T  
4-8-0 12 - Wheel 0-4-2 T  
4-8-2 Mountain 0-4-4 T Forney 4-Coupled
4-8-4 Northern 2-4-2 T  
4-10 Mastodon 2-4-4 T  
4-10-2 Southern Pacific 0-6-0 T  
4-12-2 Union Pacific 0-6-2 T  
      0-6-4 T Forney 6-Coupled
      4-6-4 T Baltic
      0-8-0 T