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BLI 7801 HO Scale Pennsylvania Q2 Duplex 4-4-6-4 Steam Loco PRR 6175 Paragon4 Hybrid Roadname_DM&IR The ideal way to getBLI 7801 HO Scale Pennsylvania Q2 Duplex 4 4 6 4 Steam Loco PRR 6175 Paragon4 Hybrid In 1942, the PRR built an experimental duplex drive freight locomotive, the Q1, with a 4 6 4 4 wheel arrangement. in 1944, after identifying a number of flaws with the Q1, the PRR built a second prototype, changing the wheel arrangement to a 4 4 6 4 and creating class Q2. This was followed by 25 production Q2 steam locomotives in 1945. These rigid frame four cylinder