Reply to "3RD RAIL FP7 Black Widows"

Number 90OGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Originally Posted by sdmann:

MU Hoses:

So the reply from our design team was...

Pictures of the F7s and FP7s show 4 MU Hoses.

And 4 hoses per side are correct for first generation units such as F-units, GP7, GP9, because they used a pair of hoses to m-u the sanders. So the research was correct.

Second generation units normally omit the outer hose on each side, as the standard for m-u operation of sanders changed to electric, using the jumper cable between each pair of units. However some roads still kept the outer hoses by special order to allow newer units to m-u with older ones. Most railroads just changed the sand control on older units to electric and never had the sander control m-u hoses on their second generation units. (Or, as in the case of Santa Fe, did not m-u first and second generation units.)

12/6/145:40 PM

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