The European Tribune is a forum for thoughtful dialogue of European and international issues. You are invited to post comments and your own articles.
Please REGISTER to post.
This doesn't make any sense to me. How is two single-track lines more capacity than one double-track one?
the main focus of medium high speed rail should be to duplicate the route of very high speed rail
Not dublicate. The VHR has less frequent stops, its new line is built much straighter, and away from smaller cities where it doesn't stop. Say, you build a VHR with stops in Philadephia, Harrisburg and Pittsburg, and upgrade the old Pennsy mainline with some cutoffs and tunnels, to run MHS with further stops in Merion, Coatesville, Lancaster, Lewistown, Johnstown and Greensburg.
One whose delusions are out of fashion.
What is a central passing loop? Some sort of round-abouts for trains?
If the constraint is crossing tracks, would not bridges be the solution?
Sweden's finest (and perhaps only) collaborative, leftist e-newspaper Synapze.se
Since the freight has priority, once a passenger train in the US leaves the passenger only lines in the Northeast, small delays cascade into massive delays as it sits in a passing loop, waiting for train A to go past a passing loop further up the route so that train B can get off the passing loop and go by the Amtrak so that the Amtrak can move. A delay of 15 minutes can easily spill over into a delay of three to five hours in tack access delays.
Now, most of these are in rail corridors that once had two way track (because there used to be far higher frequency of passenger trains and much more local freight travelling by rail). So in these corridors, you can take advantage of the existing rail right of way to put in a dedicated passenger service track.
If the frequency is brought up to the level where passing loops are needed at all, the passenger line can take advantage of the long stretches between freight trains by having switches that allow either the existing freight track or existing freight passing loop to be used as a passing loop for the passenger services.
I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.
I think if one bothers about speed at all, then only when passengers can rely on frequent trains. I mean, it makes little difference if a travel takes 3 or 5 hours when you would leave at 8 o'clock but the only trains are at 6 and 18 o'clock.
Regarding two single track, use the other for passing vs. one double-track operation, let me demonstrate that the difference is significant with the following virtual train scheme I generated.
This is a 50-mile line between two major cities, with 12 sections. The borders of the sections are considered both crossover points and stations for local trains. I put paths of twice-hourly passenger trains with 50 mph travel speed and once-hourly medium-high-speed trains with 133.3 mph top speed on it in both directions. (For simplicity, different gradient lines represent acceleration/braking for the fast trains, I didn't bother to resolve that for the local trains.)
The second line for each path represents a 2.5-minute buffer for lateness. Then: the orange fields show time-distance zones when trains can pass each other, while the grey zones represent a train travelling 'on the wrong track'. In the first mode of operation, all the grey squares must be kept free, and there is room left for only one long non-stop freight train with 50 mph per direction. In a double-track operation, you only have to watch out for the fast trains and their crossing of same-directional trains, room for around four freight train paths in both directions.
One whose delusions are out of fashion.
by Frank Schnittger - Sep 24 2 comments
by Oui - Sep 19 19 comments
by Oui - Sep 13 35 comments
by Frank Schnittger - Sep 11 5 comments
by Cat - Sep 13 9 comments
by Frank Schnittger - Sep 2 2 comments
by Oui - Sep 28
by Oui - Sep 274 comments
by Oui - Sep 2612 comments
by Frank Schnittger - Sep 242 comments
by Oui - Sep 1919 comments
by gmoke - Sep 173 comments
by Oui - Sep 153 comments
by Oui - Sep 15
by Oui - Sep 1411 comments
by Oui - Sep 1335 comments
by Cat - Sep 139 comments
by Oui - Sep 126 comments
by Frank Schnittger - Sep 115 comments
by Oui - Sep 929 comments
by Oui - Sep 713 comments
by Oui - Sep 61 comment
by Frank Schnittger - Sep 22 comments
by gmoke - Sep 2
by Oui - Sep 1189 comments
by Oui - Aug 315 comments