The EMU's of this kind or in general have a very specific behavior that isn't yet covered. When it travels across certain parts of the railway that feature a disconnection point you will hear inside and see a loud "power cut" sound and temporary "blackout" until the train reaches (hopefully) the meetup point where it can draw power from again and resume its journey and also the whole train comes back to life in an instant. This is very fun to actually experience. I highly recommend this is introduced to the M7's because I did notice disconnection points on the tracks. Hope to get a discussion going about this and interest from others as well
That's a bug not a feature. Sounds cut off in LIRR for whatever reason (might be overloading sound limit in Unreal Engine).
Doesn't look like a bug to me. It happens when you go over switches, especially large numbers of conscutive switches. At Penn, at Jamaica,... the whirring of the engine cuts out, no traction is produced for a second or two.