6-8-6? |
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In Whyte notation a 6-8-6 is a steam locomotive with six unpowered leading wheels arranged into a three-axle leading truck, eight powered driving wheels, and six unpowered trailing wheels arranged into a three-axle trailing truck.
The equivalent UIC classification is 3'D3'.
The steam turbine locomotives built for the Pennsylvania Railroad were the only ones ever to use this wheel arrangement. Wartime rationing of lightweight steel made the locomotive far heavier than originally planned, and three-axle leading and trailing trucks were needed to handle this extra weight. Though the turbines excelled when pulling trains at high speeds, their fuel and water consumption at slower speeds was unacceptably high.
Rail stub icon |
locomotive |
| Steam locomotive types |
| Single engine types |
| 0-2-2, 2-2-0, 2-2-2, 2-2-4, 4-2-0, 4-2-2, 4-2-4, 6-2-0 |
| 0-4-0, 0-4-2, 0-4-4, 2-4-0, 2-4-2, 2-4-4, 4-4-0, 4-4-2, 4-4-4 |
| 0-6-0, 0-6-2, 0-6-4, 2-6-0, 2-6-2, 2-6-4, 4-6-0, 4-6-2, 4-6-4 |
| 0-8-0, 0-8-2, 2-8-0, 2-8-2, 2-8-4, 4-8-0, 4-8-2, 4-8-4, 6-8-6 |
| 0-10-0, 0-10-2, 2-10-0, 2-10-2, 2-10-4, 4-10-0, 4-10-2 |
| 0-12-0, 2-12-0, 2-12-2, 2-12-4, 4-12-2 |
| 4-14-4 |
| Duplex engine types |
| 4-4-4-4, 6-4-4-6, 4-4-6-4, 4-6-4-4 |
| Mallet (articulated) types |
| 0-4-4-0, 0-4-4-2, 2-4-4-2 |
| 0-6-6-0, 2-6-6-0, 2-6-6-2, 2-6-6-4, 2-6-6-6, 4-6-6-4 |
| 2-6-8-0 |
| 0-8-8-0, 2-8-8-0, 2-8-8-2, 2-8-8-4, 4-8-8-2, 4-8-8-4 |
| 2-10-10-2, 2-8-8-8-2, 2-8-8-8-4 |