4-6-6-4

In Whyte Notation , a 4-6-6-4 is a Railroad Steam Locomotive that has four Leading Wheel s followed by six coupled Driving Wheel s, a second set of six driving wheels and four Trailing Wheel s.

The equivalent UIC Classification is (2'C)C2'.

This Wheel Arrangement was used by the '' Challenger '' class of locomotives on the Union Pacific Railroad . One locomotive of this class, Union Pacific 3985 is still operable, and it is currently the largest operable steam locomotive in the world. Another example, Union Pacific 3977 is on static display in North Platte, Nebraska .

Though originally intended for freight service, many units could be found leading passenger consists as well. Railroads that used the ''Challenger'' type locomotive include:

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