The Model #45 "Candle Stick" engine was made from 1952 - 1955 and was never one of Tom Sr.'s favorite engines. It was a difficult engine to build and the lack of ready brass during the Korean war forced the use of steel for the boliers on most of these engines. The steel boilers are often pinholed by rust which caused problems with the sealed heaters. Finding a brass boiler #45 is a sure way of knowing you've found a rare piece.  (hint.. you can test for this with a simple magnet)