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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: must now be taken as much higher, because during recent
years tubes have not been regularly renewed. Further, the
railways have been widely making use of tubes taken from
dead engines, that is to say, tubes already worn. Putting
things at their very best, assuming that the average demand
for tubes per engine will be that of normal times, then, if
1,000 engines are to be repaired monthly, 150,000 tubes will
be wanted every six months. Now on the 15th of June the
total stock of tubes ready for use was 58,000, and the
railways could not expect to get more than another 13,000 in
the near future. Unless the factories are able to do better
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