Watching right now a railway program on Danish TV and they are showing Jungfraubahn. That could be a nice add here on Trainsimulator.
Also only 1 speed setting, 24km/h so you are going to be spending 30 mins in the tunnel, then you have the 5 min observation stops, great if you can get out of the train and look. But in TS Classic you are stuck in the cab - JB is probably the least interesting and most overpriced of the lines in the region. A better suggestion would be the Wengeralpbahn, that is much longer, open air (with much more scenario potential) and gives great views of the Eiger, Monch & Jungfrau