Under the Whyte notation for the classification of steam locomotives, 0-6-4 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and four trailing wheels on two axles.
Other equivalent classifications are:
- UIC classification: C2 (also known as German classification and Italian classification)
- French classification: 032
- Turkish classification: 35
- Swiss classification: 3/5
Read more about 0-6-4: Overview