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BNSF Wreck in Wayzata Question
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<P mce_keep="true">[quote user="beaulieu"] <P>The DPU locomotive will stop shoving as soon as the emergency brake application reaches it. The signal will pass through the trainline at near the speed of sound. The very brief push from the DPU and the momentum of the trailing cars will start the jackknifing if any cars get far enough out of line. The similarly brief pull of the lead locomotives and momentum of the leading cars will tend to keep cars from jackknifing, but if a coupling breaks they start to pileup. <BR></P> <P>[/quote]</P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=verdana,geneva>Beaulieu,</FONT></P><FONT face=verdana,geneva> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=verdana,geneva>Your explanation makes sense.<SPAN style="mso-spacerun: yes"> </SPAN>I would tend to conclude that the momentum jackknifed the cars more so than the DPU locomotive shoving.<SPAN style="mso-spacerun: yes"> Although someone else mentioned that the train was only moving 10 mph. </SPAN>The train pulled a few of the derailed cars some hundreds of feet beyond where the other cars jackknifed.<SPAN style="mso-spacerun: yes"> </SPAN>I believe at least one of them was standing upright completely separated from the pileup and from the cars ahead of the pileup.<SPAN style="mso-spacerun: yes"> </SPAN>A loaded coal car sure does not look like it wants to roll very well on the ballast.<SPAN style="mso-spacerun: yes"> </SPAN></FONT></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=verdana,geneva><SPAN style="mso-spacerun: yes"></SPAN></FONT> </P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=verdana,geneva><SPAN style="mso-spacerun: yes"></SPAN>Would the engineer continue pulling with the lead locomotive when the brakes dynamited from the derailment?<SPAN style="mso-spacerun: yes"> </SPAN>I have heard of that being done to help pull derailed cars ahead and possibly reduce the pileup if a derailment happens to be the reason the brakes went into emergency.<SPAN style="mso-spacerun: yes"> </SPAN></FONT></P><FONT face=verdana,geneva> <o:p></o:p></FONT> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face=verdana,geneva>At least the last two cars of the leading section of train were on the ground and appear to have been dragged several hundred feet while being on the ground.<SPAN style="mso-spacerun: yes"> </SPAN>Somehow those derailed cars managed to cross Ferndale Road crossing without tearing up the crossing.</FONT></P> <P><FONT face=verdana,geneva></FONT> </P>
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