4-4-0, in the Whyte notation, denotes a steam locomotive with a wheel arrangement of four leading wheels on two axles (usually in a leading bogie), four powered and coupled driving wheels on two axles, and no trailing wheels. First built in the 1830s, locomotives with this wheel arrangement were known as "standard" or "Eight-Wheeler" type.
4-4-0, in the Whyte notation, denotes a steam locomotive with a wheel arrangement of four leading wheels on two axles (usually in a leading bogie), four powered and coupled driving wheels on two axles, and no trailing wheels. First built in the 1830s, locomotives with this wheel arrangement were known as "standard" or "Eight-Wheeler" type.
Source: Wikipedia "4-4-0" · CC BY-SA 4.0
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