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Pennsy Q Class Classic Power 5 PRR Soft Cover SEVERAL loose pages
Pennsy Q Class Classic Power 5 PRR SEVERAL LOOSE pages
Soft Cover
Copyright 1982?
88 pages
CONTENTS
The Pennsylvania RR Q-2 Duplex
Q1-Q2 Roster
Scale Model PRR Railroad Class Q-2 4-4-6-4 No 6193 Diagram
Bed Frame
Cab Details
Tender Cross Sections/Tender Bed Frame
Railway Mechanical Engineer PRR Q-2 Locomotives
It must have resembled an active volcano the day in February 1945 when PRR Q2 #6175 developed nearly 8000 indicated horsepower while standing still in the Altoona Test Plant. There it stood shaking, roaring and clanking with its 5 pairs of 69" drivers spinning at 280 RPM on the massive water brakes. Nearly half of the coal fed into its enormous firebox did not have time to burn, but was merely spread over downtown Altoona in the form of a black rain of hot particles. Along with the black rain was a lot of noise, smoke and other socially undesirable things. But this was another era with no EPA to stop such events from happening and smoke, cinders and coal dust meant only prosperity to wartime Altoona.
Over the intervening years, the results of this day have caused much speculation as to whether the Q2 achieved the highest power output ever achieved by a steam locomotive. Certainly it was a record for the PRR test plant, but the largest locomotives belonging to most other roads were never tested there. Higher net levels of horsepower measured by different means have been reported on rare occasions, such as the C&O Allegheny (2-6-6-6) which reached 7500 drawbar horsepower (DBHP) at 46 MPH. This would represent a higher output than the 7987 indicated horsepower (IHP) of the Q2 due to the fact that IHP is gross horsepower measured at the cylinders, while DBHP is net horsepower available to move a train after the power necessary to move the engine and tender has been utilized. Other very large locomotives, such as the NP Yellowstone (2-8-8-4), fell far short of the Q2 in horsepower output due to design problems.
While the Q2 was a producer of power without peers on the PRR, it was still doomed to a short life by the economics of other steam locomotives that were cheaper to operate and the inexorable march toward dieselization which doomed all of steam. This book is the story of that effort in the waning years of steam operation.
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