As much as I fancy all of the Gilbert die cast steamers, I have the warmest spot in my heart for the PRR K5s. The full-featured No. 316 is my favorite and looks great and so Pennsy heading up the 1953 K5345W Trailblazer Steam Passenger and Mail Train, which may be viewed strutting its stuff in American Flyer Legends in Action from TM. In the Lionel-AF Modern Era, I feel that the Y3 is the operational and visual knockout, particularly as the PRR version.
Bob