This area is Fridley, north of the I-694 Interchange, about one mile. The easiest way is to take East River Road north, past I-694, to the first set of residential streets, on the right will be the tracks, a street will run between the tracks and the houses. I've not been there in two years, but I seem to recall the street to turn on was 51st. You may have to hunt a bit, sorry. When you find it, a great afternoon spot is yours.
Large trees provide welcome shade on a hot day.
Park along the street which parallels the tracks. Behave yourself and no one will complain. Trains are viewed across a large, mowed grass field with a nice treed background behind them. There were once four different rail lines leading to superior from the Twin Cities. Chicago and Northwestern and Soo Line have trackage rights to Superior over BN's route.