Well if it costs the same, then go for 200km/h. I believer over 200km/h will cost more. Of course a train won't run at 200km/h (just like airplanes don't travel at full speed, but at cruising speed). But since they either travel at 175, 176, 177 or whatever, i'd just use the max speed of 200.
We're building gawadar train track to china (west pakistan), which I suppose can be heavily used for goods supply and karachi to peshawar can be used for passenger service (since these tracks cover majority of population). We can also use frieght and passenger combo I suppose.
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See west Pakistan is like empty, since population there is not a lot. Hence we don't need o have dedicated tracks. Instead west Pakistan can do goods (since gawadar is basically being built for pak-china corridor) and east pakistan can do passenger (as majority of population lives there).
We're poor nation so double tracks is out of question. Now tell me, is upgrading existing tracks cheaper/better or building new ones? For example, build a seperate 200km/h track for passenger and leave the existing tracks for cargo.
Your main industrial belt is in and around Karachi, Lahore and Sialkot. You cannot ignore the current industrial regions which bring maximum revenue to Pakistan, because of what Gwadar may or may not become one decade from now.
So double tracks are necessary there to raise the speed of both goods trains as well as passenger trains.
In Balochistan and like areas however, only a single track will suffice since there are few people to use the passenger services.
Over 200 kmph requires different tracks and hence becomes expensive. Therefore a semi-high speed n/w (with a real average speed of 150-170kmph, a theoretical maximum speed of 200 kmph) serves as a nice compromise to building a countrywide HSR.
An HSR may be built for marquee purposes as a showcase in one route or two depending on the need. Maybe Lahore to Islamabad.
The Indian HSR will be built between Mumbai and Ahmedabad(Gujarat).
Same amount of money could have given Lahore an underground rail network to support mass transit, reducing traffic on the road. He has played havoc with Islamabad and plans to play the same havoc with Karachi also. He has to realise that solution for these megapolis is not metro buses but metro trains supported by buses, with major load on trains; that too underground.
If wishes were horses, beggars would ride(India and Pakistan both to the beggars list).
You need to understand that while you are right in that a proper Metro(as opposed to a BRT which is called MetroBus in Pakistan) is required to alleivate the traffic issues of any major populated city, a completely underground metro network is far too expensive for developing countries.
Almost every country building a Metro now uses a blend of underground and elevated tracks to balance costs. In the areas where there is no space or a lot of congestion, the Metro goes underground, in areas where the roads are wide and there is space, the Metro tracks take the elevated route.
Per kilometer, an underground track takes around
4-5 times the per kilometer cost of an elevated track. For example, if the elevated metro track costs INR 30 crore per km, then the underground section in the same area would cost round INR 150 crore per kilometer!
You cannot wish away these realities. Though I agree that a completely underground Metro is the most desirable solution and makes the city appear less cluttered!
And building a Metro is multiple times more expensive than building a BRT.
Which is why almost all countries building Metro's now use both - underground sections and elevated sections while also building BRT that integrates with the Metro network to balance costs and make the transport system of the city financially viable so that it sustains.