class 90 in tandem
In the gallery is a picture of two class 90s hauling an intermodal.
Why are two needed ? Is it A) one is not powerful enough B) in case one fails C) using the path to relocate one. D) none of the above.:) |
A and B I think Philip.
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It is usually because a single loco (with Bo-Bo wheel arrangement) can have adhesion problems with heavy loads on steep gradients. Freightliner often uses pairs of Class 86 for the same reason.
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