LNWR Precursor Class

The London and North Western Railway (LNWR) had three classes of steam locomotive identified as Precursor Class:

• LNWR Webb Precursor Class of 1874–1879 by Francis Webb, a 2-4-0
• LNWR Whale Precursor Class of 1904–1907 by George Whale, a 4-4-0
• LNWR Precursor Tank Class, 4-4-2 tank engines based on the Whale precursors