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SECR P Class. It's basically an underpowered knockoff of an A1 Terrier. Despite this 8 were built, and 4 are now preserved! Not bad for a something once considered useless.
>They were inspired by, and loosely based on, the more successful LB&SCR A1 Class "Terriers" and eight were built in 1909 and 1910. They were originally intended for lightweight passenger trains, to replace underpowered steam railmotors. Certain cost-saving design compromises had been made, compared to the Terrier design, and the P class were found to be underpowered, having only 73% of the Terrier's tractive effort
[spoiler:lit]Also the SECR livery is so damn sexy[/spoiler:lit]