Top Gear | Top Gear (2002 TV series) | Top Gear (current format) | Landing gear | Fifth Gear | gear | Valve Corporation | Metal Gear | Nigel Gresley | Metal Gear Solid | landing gear | W. Michael Gear | Sega Game Gear | Metal Gear Solid 2: Sons of Liberty | Metal Gear (series) | Metal Gear 2: Solid Snake | Gear Fighter Dendoh | Fixed-gear bicycle | Conventional landing gear | conventional landing gear | variable valve timing | Valve | Top Gear (1977 TV series) | Synchronization gear | Poppet valve | Gear | Walschaerts valve gear | valve | tricycle landing gear | Sir Nigel Gresley |
When working for the GWR, Holcroft collaborated with Sir Nigel Gresley to invent and patent the Gresley conjugated valve gear for three-cylinder steam locomotives.