Two Chinese bullet trains completed a crossing test at a relative speed of 840km/h

[AndrewJin]

On test trials yes, Talgo trainset with a diesel locomotive clocked 180 kph.
but we must remember here that it ran on a broad gauge track with signalling support upto 200 kph only.
@Śakra

Infrastrucutre here won't support any higher speed, especially in commercial services.

We never use old compartments for a speed over 160km/h though the locomotive itself can achieve 270+km/h.
We actually use the same EMUs from new HSRs on upgraded old railways.

 

[anant_s]

We never use old compartments for a speed over 160km/h though the locomotive itself can achieve 270+km/h.
We actually use the same EMUs on new HSRs on upgraded old railways.
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You would recall andrew, we discussed how simply having a high HP locomotive doesnot equals high speed or heavy hauling capacity. You need a corresponding investment and capability addition on tracks and coaches as well.
Besides, it is just not safe to run a high speed train or haul a heavy freight without proper engineering analysis and certification on old(er) lines.

 

[AndrewJin]

@anant_s My wrong. The highest speed of locomotives on a real railway (not lab) was 240km/h in 1998, class of SS8. But the highest speed with double-decker cars was 212.6km/h. We are actually testing the locomotive with an operation speed of 200-250km/h with passenger compartments, but I think it won't be quite useful! (maybe for night trains on HSRs).

You would recall andrew, we discussed how simply having a high HP locomotive doesnot equals high speed or heavy hauling capacity. You need a corresponding investment and capability addition on tracks and coaches as well.
Besides, it is just not safe to run a high speed train or haul a heavy freight without proper engineering analysis and certification on old(er) lines.

That's right.
Actually locomotives can easily achieve some high-speed, but the rest of a train cannot!

 

[Śakra]

Isn't the fastest one so far Taglo?
150km/h is totally OK on old railways.
Tilt train technology can further increase speed.
During 1990s-early 2000s, we upgraded a lot of old railways to 200-250km/h, but it was quite expensive. Now, we seldom used the speed 200-250km/h (except a few) on old railways, because it will affect freight trains. But one benefit of those 6-7 rounds of speed-up campaigns made all crossings on trunk railway replaced by tunnels or flyovers. We also operate 200-250km/h sleeper bullet trains at night on the old railway.
@anant_s

If we were able to do large scale public works without the 10 million special interests getting in the way that would be the best way to do things, several step up campaigns. Unfortunately we can only greenfield large works (see dedicated freight corridor which has underpasses instead of at grade crossing) and those too are bogged down by said special interests.

 

[AndrewJin]

If we were able to do large scale public works without the 10 million special interests getting in the way that would be the best way to do things, several step up campaigns. Unfortunately we can only greenfield large works (see dedicated freight corridor which has underpasses instead of at grade crossing) and those too are bogged down by said special interests.

Upgrading old railways or building new HSRs indeed cost a lot!
But we do have hope, it could be profitable, especially when people's living standards are getting better!
https://defence.pk/threads/1318km-b...6-6-billion-yuan-1-05-billion-in-2015.440039/