No subject

...the S-Bahn...has come to a grinding halt.[in Berlin]

More than two-thirds of the network's 550 trains were withdrawn from service 
last week and the main east-west line closed after safety checks following a 
derailment showed that about 4000 wheels needed replacing.

Deutsche Bahn... is under fire for cutting staff and closing repair 
workshops at its S-Bahn subsidiary in an attempt to boost profitability 
ahead of an initial public offering, which has since been postponed....

Deutsche Bahn has apologized for the inconvenience but insists that 
cost-cutting was not the problem and blames the train manufacturer instead.
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In this last claim,  I think Deutsche Bahn may be correct.  Need to see some 
more data, but this sounds like a manufacturing flaw in wheel contour or a 
metallurgical flaw.

Cars usually are configured with 8 wheels, so 4000 defective wheel is 500 
cars.  That's nasty.  I mean truly, truly nasty.