by _o_OOOO_oo-Kanawha » Sun Mar 25, 2012 7:58 am
When is was bad for the engine's "health" just imagine how it must be for a crew riding a mid train helper, pusher or caboose.
Not to mention how bad it must have been during the steam era. I am currently reading in on the C&O Alleghany Division and even in the much shorter Lewis and Big Bend tunnels crews suffered badly from heat and foul air. C&O installed forced ventilaton, much like PRR did in Gallitzin Tunnel on the HSC. Imagine how it must have been in those high altitude tunnels of 5 miles or more in length.
Modern Diesels have pressurized cabs with air filtration? Otherwise crews might still suffocate/asphixiate when they get stalled insde a tunnel and have to drop back through their own exhaust. Modern units have more power but also more things that can break, fewer are lashed up so if one fails you are in trouble right away.
Overhere in the Netherlands we have only articficial tunnels, some of which go under water and have upwards slopes a both ends. A stalled train also rolls back to the deep center, but smoke can escape along the ceiling. Mountain tunnels usually have a hump in the middle of their profile, so that trains and water run towards the ends but smoke and heat gets trapped unless there are vertical ventilation shafts through the mountain. Our land tunnels are not deep, more level but quite long, up to 15 km, they have escape shafts and stairs every 500 meters. I know that all electric and Diesel locomotives used in freight service have breathing kits on board for emergency use by the driver in case of gas or smoke alarm inside tunnels. Passenger trains have not and should never stall inside a tunnel, no doubt the rules say so but I don't know about overrunning red absolute block signals with ATC in use. Yet we don't have emergency brake pulls in the passenger compartments that can be overruled by the driver so he can bring his train out of immediate danger in case of fire. We only have to wait for disaster to happen not to mention the threat of terrorism. Companies operating Chunnel, TGV and ICE know better, their passenger emergency pulls only signal an emergency and allow the driver to maintain full control instead of dumping the air and possiblly stalling the train in the worst spot possible.
All tunnels are automatically monitored 24/7 and false alarms are quite common unfortunately. With the current trend towards more and ever longer tunnels, both road and rail, safety is paramount. Just count all the people perished inside tunnels all over Europe the last couple of years. A gruesome toll has been paid for our mobility.
Edwin "Kanawha"
The Chessie, the train that never was ... (6000 hp Baldwin-Westinghouse steam turbine electric)