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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Crisis in Russia by Arthur Ransome: actually mending engines, parts of which have already been
taken out and used for the mending of other engines. There
are consequently abnormal demands for such things as
shafts and piston rings. They are particularly short of
Babbitt metal and boiler tubes. In normal times the average
number of new tubes wanted for each engine put
through the repair shops was 25 (10 to 15 for engines used
in the more northerly districts, and 30 to 40 for engines in
the south where the water is not so good). This number
must now be taken as much higher, because during recent
years tubes have not been regularly renewed. Further, the
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