I'm enjoying the quality of these models in this set, although the lack of air venting when the air is cut into passenger mode is killing the immersion. When the air is cut into freight it's also not correct, as the air never stops venting after a reduction and has equalized, yet you can hear the burst of air when making further reductions. From watching the pre-release stream for this, it would appear the same. You could hear the air venting when he temporarily cut it into freight, then further air vent sound disappears after it's in passenger mode. From the following video, you can clearly hear air venting into the cab when making brake pipe reductions: The bombardier cab car on the other hand sounds great!