GTW/ CN style cab for MDC Roundhouse Harriman 2-8-0 or 4-6-0. Use in converting the Roundhouse Harriman engines to Grand Trunk Western or Canadian National 2600 series 2-8-0 or 1600 series 4-6-0 Engines. The two pads at the lower rear of the cab may be filed as needed if you are modeling an engine with a sag in the cab such as sometimes developed in later years