Unfortunately the only thing that remained after the rebuild were the wheels!fighterpilot wrote:Oliver Bulleid certainly used a unique design with these locos, the chain driven valve gear, Bulleid Firth Brown wheels, 'air smoothed casing' etc. Richard
The chain drive valve gear was not the first choice, Bullied wanted to use a prop-shaft with gears, but because of war time conditions the gears could not be fabricated. So, as there not being room to accommodate Walschaert valve gear, he opted for the chain driven valve gear that had corrosion problems because water leaked into the 'sealed' oil bath and, at the same time became a fire hazard because oil leaked out saturating the boiler lagging. The oil leaks also contributed to wheel slippage. After time, due to chain wear, the valve timing also went to cock.
The wheel design was chosen for it 10% reduction in weight over conventional designs, the ability to dispense with the Gibson retaining ring, no loose tyres and a better distribution of stresses. With no reciprocating balance weights were embodied which reduced track hammer blows, but weights were inseted into the wheel rims.
Here a couple of shots of Clan Line in her original guise, both illustrate the wheel design


Oliver Bullied designed two other locomotives for the Southern, both were unique
The Q1

The Leader.
While the driver has a reasonable ride the fireman was parboiled in the middle of the locomotive
After the unsucessful Leader he left BR, as it was then, and joined Irish Railway and built a similar looking peat burner
















