Field Hill
These were followed in 1929 by the most powerful steam locomotives in the British Empire , twenty 2-10-4 Selkirks . A further ten were built in 1938 and a final six in 1949 , the last one being 5935 , the last steam locomotive built for the CPR . 
<triplet> Selkirk <subj> 2-10-4 <obj> wheel arrangement