BNSF fuel tenders.

[KBCpresident]

When they repaint them do you think they will be black with BNSF's new logo or will they be orange. BN painted their tenders green and black rather than black like the tender I saw, maybe BNSF will do the same.

[Bob-Fryml]

The BN fuel tenders were indeed painted green and black, and were basically company service tank cars fitted with transfer hoses and other items to serve as fuel tenders.  They were part of an attempt to reduce the number of fueling points for locomotives, especially those in intermodal and coal service.

To add to Paul's comments, during the 1980s BN ran a series of Chicago-Seattle hotshot piggyback trains equipped with specialized power lashups.  The pictures I saw usually featured two SD40-2's coupled together and facing west, two SD40-2's coupled together and facing east, plus a fuel tender tank car spliced into the middle.   The fuel tender had m.u. cable receptacles on both ends, full sets of m.u. hoses (independent brake + actuating + main reservoir) hookups, and the required train brake hoses like any other railroad car.  Each of these specialized power lashups could make a full round trip between The Windy City and Puget Sound on one fillup.  BN's thinking was this:  fill the engines and fuel tender just once, but only at the cheapest fueling point along the route.  In other words, BN was playing fuel supplier against fuel supplier in order to get the lowest delivered price possible.

During the 1980s (and it may still be true today), piggyback operations - while a growing source of traffic to be sure - were also the least profitable on a per unit handled basis; so, BN, like any other railroad, had to watch fuel costs in order to be able to wring any meaningful profit out of this service.  Incorporating fuel tenders into their hotshot power consists may have been part of BN's effort to improve this segment's profitability.

[Railfan1]

When they repaint them do you think they will be black with BNSF's new logo or will they be orange. BN painted their tenders green and black rather than black like the tender I saw, maybe BNSF will do the same.

I doubt they would ever get repainted. But, anything is possible...