CIE (Irish Railways) Class 121 diesel no124. Following the shortcomings of the earlier diesel engines CIE bought it's next batch of Locomotives from General Motors in the US. The first being the 121s which were similar to the BR Class 20 Bo-Bo with a single cab, a feature which drivers didn't like very much so, like the class 20 they were usually coupled in pairs at the nose, thus improving both power and forward vision.
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