When you drive full throttle above 25mph with the MBTA F40ph-3c, you begin to hear small snapping/cracking sound in every 5 seconds. This issue makes the audio loop really noticable and is really distracting from the othervise great cab sounds. This issue appears to me on the Ps5 version of the game.
I play on PS4pro. It happens most often around Boston. In the cab of the locomotive, or inside the wagons, I hear an unpleasant whistling sound at high frequency. That sound disappears when I leave the locomotive or wagon. Often this sound disappears while driving and returns.