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I know Allied Wire and Cable sell multi-specifications of Diesel locomotive cable (DLO) with customizable length too. I don't know about color customization because DLO cables usually come in black. I happen to know to a contractor supplier of traction motor cables and use a sales representative from Allied Wire and Cable. Here is a link to their dlo cable page if it helps. Cheers. https://www.awcwire.com/productspec.aspx?id=dlo