Rapido 033039 HO Scale MLW M420 Diesel Oil Creek & Titusville 3568 Roadname_Seaboard Air Line The best way to tell

The best way to tell them apart is to look for the circulators on the firebox just above the running boards

Belt-Driven 4WD

servos and receivers (without connecting any extra battery)

S-3A Viking

Rapido 033039 HO Scale MLW M420 Diesel Oil Creek & Titusville 3568 Roadname_Seaboard Air Line The best way to tellRapido 033039 HO Scale MLW M420 Diesel Oil Creek & Titusville 3568 The M420 was equipped with the ALCO 12V 251c3 prime mover producing 2000 H. P. Most M420 units rode on MLW ZWT (Zero Weight Transfer) trucks. The only exception to this were the 5 units built for the Providence & Worcester, which rode on ALCO trade in FA trucks. The P&W required a different bolster design and a slightly different truck spacing, making them unique. MLW constructed 103