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Hello ronald1...MU refers to the 'multiple-unit' connections between the units that require the coupling up of the multiple air hoses you see between the said units. These air hoses help the continuty of air-brake, train line air, main resevoir (excuse the spelling), independent-air, and sanding capabilities. When multiple consists are running together 'light', it is possible to get the job done with just the 'brake-pipe' hose connected, though this practice is strongly discourged...take care...Hommie
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