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So, according to what has been described, the rail washers existed in two different types of application.  One washed ahead of the engine to remove leaves, oil, etc., so those contaminants did not degrade traction; and the other washed behind the drivers to remove the traction sand so that it did not produce rolling resistance to the rolling stock of the train.  I wonder if any locomotives were set up with both systems.  <o:p></o:p> I would imagine that washing ahead of the locomotive would not necessarily replace the use of sand, although it might in certain circumstances.  I can also imagine that removing the sand behind the drivers by the use of high pressure steam might accentuate the cloud of swirling grit that the could have an abrasive effect on the running gear of the following cars of the train.
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