That is the twin (?) turbine fan blades spinning up and then running at full speed. The door provides a pressure barrier to the compressed air from the turbines so the exhaust can be blown (pushed) from east to west and clear out the tunnel.
What's the direction of the air the 2 fans blow? The air moves from the East to West side or from the West to the East side? Somebody explain me, I don't understand.
The roll-up door is the original, as far as I know, while the door that slides in from the left was implemented to replace it as there were mechanical problems with the roll up door. This was probably taken after a train went through the sliding door and they were waiting for a replacement, so they used the rolling door in the interim.
this is the first open/closeable railroad tunnel entrance I´ve ever seen. Why is this needed here? Because of the exhausts? Couldn´t the exhausts get out faster with open doors?
Door is need to let the fans suck the exhaust up the exhaust shaft. The tunnel is uphill from the west. So, exhaust naturally travels upward with fans sucking upward with the door helping the process.
This tunnel must surely be a bottleneck. How many trains pass through in an hour?
Nigel16032009 1 year ago
7.8 miles long? damn...
bond1011 1 year ago
They have to blow their horn first before they enter/exit the tunnel.
lordbemylight 2 years ago
What is that sound after the tunnel has been shut?
moonwalker5058 2 years ago
That is the twin (?) turbine fan blades spinning up and then running at full speed. The door provides a pressure barrier to the compressed air from the turbines so the exhaust can be blown (pushed) from east to west and clear out the tunnel.
mrksvideos 2 years ago
Those turbines do make a great sound!
moonwalker5058 2 years ago
What's the direction of the air the 2 fans blow? The air moves from the East to West side or from the West to the East side? Somebody explain me, I don't understand.
videocreatorgr 2 years ago
West to east. the fans act as the tunnels "vacuum"
truckinman86 2 years ago
How many tunnels in the US have a fan system like this. I can think of one other and that is the Moffat Tunnel.
southparkline1 2 years ago
The roll-up door is the original, as far as I know, while the door that slides in from the left was implemented to replace it as there were mechanical problems with the roll up door. This was probably taken after a train went through the sliding door and they were waiting for a replacement, so they used the rolling door in the interim.
shadynebey 2 years ago
this is the first open/closeable railroad tunnel entrance I´ve ever seen. Why is this needed here? Because of the exhausts? Couldn´t the exhausts get out faster with open doors?
GeileSexyZeiten 3 years ago
Door is need to let the fans suck the exhaust up the exhaust shaft. The tunnel is uphill from the west. So, exhaust naturally travels upward with fans sucking upward with the door helping the process.
VanWADebbie 3 years ago
The exhaust would overheat the locomotives and poison the crews. Exhaust is hot and will rise faster upward, rather than outward.
VanWADebbie 3 years ago
Very interesting video
foudurail 3 years ago
Nice, now i know why the doors are used ! :P
dashloc 3 years ago