New Machinery for a Damaged Brass Pacific
Model Railroader 1985-10 pg. 96 Scale: HO Category: "Locomotives - Steam"
The author describes how he replaced the frame and mechanism of a badly-behaving brass locomotive with Bowser parts.
Remotoring for Better Performance
Model Railroader 1985-12 pg. 94 Scale: HO Category: "Locomotives - Steam"
The author describes how to remotor (mostly) steam models by AHM/Rivarossi, Athearn, Bowser, MDC, and Mantua (Tyco). An Athearn GP9 is also covered.