Class 51 may refer to:
- Belgian Railways Class 51
- DRG Class 51 a German class of steam freight locomotives
- Class 51.0: ČSD Class 623.0
- Class 51.7: Oldenburg G 1
- EAR 51 class - former KUR EC1 class
- LT&SR 51 Class
This disambiguation page lists articles associated with the title Class 51.
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