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Firebox-Spy-Hole

Written by Stephen Lawrance on .

In this colour photograph, Big Boy 4014’s firebox has the spy hole open so the fireman can check the condition of the fire, seen burning almost white hot.

In this colour photograph, Big Boy 4014’s firebox has the spy hole open so the fireman can check the condition of the fire, converted from coal to oil during the rebuilding of the locomotive.