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I've often wondered if there is rhyme or reason as to how PU's are arranged. Of course there is a reason, but this week I saw 7 power units leading the pack. Front unit was a Canadian Pacific, Soo, unknown, Iowa Chicago Eastern, CTX, Canadian Pacific,GITX . Also what reason is there if any for some to be turned 'backwards' in the lineup? I snapped a few quick pics off my cell phone but it has no zoom capability so the pics are not nice close ups. I also need to read FAQ here to see how to post pics as well. I'll try and 'attach' a pic below here....
There is no specific reason as to the direction of the engines other than if it's power that will turn back on another train, then they would want a good one to lead in the opposite direction (preferable a wide-body that would afford better collision protection, A/C equipped, more quiet, etc.) Usually, the middle units are just as they line up from other consists, only we (CSX) like to place DIT (dead-in-tow) units at the rear of the consist. Then if tonnage allows you to isolate/shut down power, you wouldn't have to pass through the dead units to get to the units to be isolated/shut down.
Thanks Walt...that's interesting to hear. I never gave it a thought re: a wide body for better collision protection. Guess I figured the locomotive always wins in a collision regardless. When you say wider I suppose at a crossing accident it would tend to spread/deflect more away to the sides of a unit. Is there more?
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