I've taken a look at this app, its very primitive to say the least. So here's my quick thoughts.
Speed controls, you simply push a button to increase the speed at a specified interval. You keep pressing the button to increase the speed, the same with decreasing it. There is no "power/brake" controls or anything like that, no handle, nothing.
Graphics, they're pretty much on par with the old "classic" BVE 2 style'd graphics.
Sounds, just a typical train moving loop, plays the same at all speeds. Horns, and bells are there though.
Train selection, the R160, and the PA-5 yes they are included, there are a handful of other routes/trains as well, but they all make more or less the same sound.
Perhaps the app will get better in the future, the author appears to have mentioned he created the app for his child, which is very nice of him! But certainly not for hard-core rail fans.