There are a lot of train accidents happening nowadays in Pakistan so it's best to be careful and thoughtful about trains.
Air plane is cheap, not that bad on AirBlue and all.
Coming by Daewoo is something I'm not aware of therefore I'll refrain from commenting on it.
Whichever mode you choose, think long and hard where trains are concerned because the train tracks are something which Pakistan hasn't changed since the time of Pre-Partition.
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