This is pretty much normal practice for events at Lucas Oil Stadium. When games were played at the RCA Dome, all rail traffic was halted during entire football games. Now, with events at LOS, they generally only stop rail traffic for the hour leading up to kick-off. The Super Bowl is a big enough event that they will stopping traffic as Tim described. Luckily, Sunday is not a high traffic day, so holding trains for a few hours won't cause a major disruption.
As for where trains will be parked, a lot will depend on timing and rail traffic levels. East bound trains will probably just not be allowed to leave Avon Yard. West bound trains will be stopped anywhere between Anderson and downtown Indianapolis. The line between Indianapolis and Anderson is double track, so they can park trains on one of the mains and still keep the other main open. The biggest issue is what to do with the crews. If they take the crews off the trains, they will have to stop the trains someplace where it's convenient to pick up the crew and deliver the replacement crew when they decide to start moving trains again. Anderson is a good spot for that, but Anderson Yard doesn't have enough tracks to store very many trains.
Mark, the Indianapolis Terminal uses 160.800 as the road frequency and 160.560 as the dispatcher frequency.