I hadn't heard of a Super Bowl Special until now... it's a passenger train on the normal freight transportation line, used to entertain big customers of the railroad during the days up to the game.

 

in 2016 BNSF ran their train empty to the Port of Oakland, where the train was used by some guests to stay on the train in lieu of sold out or extremely expensive hotel accommodations.

 On the day of the game, BNSF ran the train down to Santa Clara, where all the guests were able to access the stadium.