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There can be alot of reasons and you might get alot of answers on this one. Many guidelines are not always followed. One thing I'll mention is that when I see trains returning on a turn the lead unit just happens to be what had earlier been the trailing unit by chance. I've even rarely but recently seen long hood forward because of this. <br /> <br />Some units cannot lead, ie; B units, ditch lighting, pilots and cab signaling where required. <br /> <br />Some crews will live with a crappy lead unit because they would have to wye or switch the units around themselves as long as it's not against the rules.
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