PRR Q2

The Pennsylvania Railroad's class 'Q2', using the same boiler from the PRR Class "J1", comprised one prototype and twenty-five production duplex steam locomotives of 4-4-6-4 wheel arrangement. They were the largest non-articulated locomotives ever built and the most powerful locomotives ever static tested, producing 7,987 hp (5,956 kW) on the PRR's static test plant. They were by far the most successful duplex type. The duplex propensity to slip was combatted by an automatic slip control mechanism that reduced power to the slipping unit.
Despite overall success, the Q2s were all out of service by 1951. With dieselization, they were the obvious first targets to be withdrawn since they were only a little more capable than the conventional J1 class 2-10-4s but with far higher operating and maintenance costs.

Contents

References

References

★ Pennsy Power, Staufer, Alvin, , , Staufer, 1962, LOC 62-20872

★ Loco Profile 24: Pennsylvania Duplexii, Brian Reed, , , Profile Publications, 1972,

★ Classic Power 5: Pennsy Q Class, Harley, E.T., , , N.J. International, 1982, ISBN 0-934088-09-8
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