Well designed and good performers in theory .
They lacked the advantages of streamline casing and especially suffered from problems associated with the high - pressure boiler that needed specially designed lubricators that were not available in the impoverished post-war Spain .
Although well designed and good performers in theory , they lacked the advantages of streamline casing and especially suffered from problems associated with the high - pressure boiler that needed specially designed lubricators that were not available in the impoverished post-war Spain .