One specialist exception , the GER Decapod , had been built in 1902 .
The main heavy mineral locomotive design was the 0 - 8 - 0 , on both the L&YR and the LNWR .
One specialist exception , the GER Decapod , had been built in 1902 , but the main heavy mineral locomotive design was the 0 - 8 - 0 , on both the L&YR and the LNWR .