Posted by Dean on January 18, 2018 at 10:02:26 from (68.50.160.151):
In Reply to: Re: Advanced Steamer posted by carvel minne farmer on January 17, 2018 at 17:43:53:
Unlike an internal combustion engine, a reciprocating steam engine creates maximum torque at stall.
I grew up near the B & O Railroad and am old enough to remember the steam helper engine stationed less than 1/2 mile from our house until the fires were dropped for the last time in 1957. The helper engine was needed to help the heavy freights up the 12+ mile hill out of the Ohio River valley. The freights, pulled by a couple of heavy steam freight locomotives or a consist of 3 or 4 diesel F units would stop with the caboose about 1/2 mile from my bedroom window. The helper engine would then follow and couple to the caboose.
Starting a heavy freight with a steam locomotive is a bit of an art as the torque is difficult to modulate at stall and the wheels were prone to slip. After coupling, and a couple of whistle signals between the engineer(s) in the head end locomotives and the engineer in the helper locomotive, they would push off. Generally, after a couple barks of the exhaust,, the wheels would slip, the side arms flailing wildly, until the engineer could pull back on the throttle and pour on the sand. Usually, on the second effort, there was enough slack in the consist, that the locomotives could accelerate the train.
Wonderful memories, no doubt responsible for my fascination with reciprocating steam engines of all types.
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