Editing Whyte notation (section)

=== Duplex locomotives ===
For [[duplex locomotive]]s, which have two sets of coupled driving wheels mounted rigidly on the same frame, the same method is used as for [[Mallet (locomotive)|Mallet]] [[#Articulated locomotives|articulated locomotives]] – the number of leading wheels is placed first, followed by the leading set of driving wheels, followed by the trailing set of driving wheels, followed by the trailing wheels, each number being separated by a hyphen.