4-8-8-4
|
|
In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-8-8-4 is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck.
The equivalent UIC classification is (2'D)D2'.
The only significant 4-8-8-4 locomotives built were the Union Pacific 4000 "Big Boy" Class.