HS1 maximum permitted speeds between St Pancras and Stratford

[jnjkerbin]

Hi,

Would any SE high speed drivers or others out there be able to tell me the top speed the 395s reach between the two stations. Its hard to gauge as a passenger in a tunnel.

Joe

 

[Class377/5]

Hi,

Would any SE high speed drivers or others out there be able to tell me the top speed the 395s reach between the two stations. Its hard to gauge as a passenger in a tunnel.

Joe

All London tunnel area is limited to 110mph I believe.

 

[jnjkerbin]

Ah right, thank you. Using the accleration/ decceleration value from wiki it would therefore take 2m37s to reach 110mph (presumimg the track was flat and acceleration were constant which they aren't) and 2m2s to stop (presuming braking was constant 100% efficient which it isn't) so it should be able to reach 110mph in the 6 minutes. Whether it does or not is another matter altogether!

Thanks
Joe

 

[TGV]

230km/h for cl373 if you wanted a comparison (just over 140mph).

 

[Class377/5]

230km/h for cl373 if you wanted a comparison (just over 140mph).

Nope, 110mph is for all stock in the London tunnels. They are too close to St Pancras to need higher speeds really.

 

[starrymarkb]

I thought the limiting factor to 230km/h was the tunnel bores

 

[Peter Mugridge]

What about the outer tunnels between Stratford and Dagenham? Pretty sure there's a higher limit there as I have many times entered and exited the tunnel at the Dagenham end at 125 to 130mph.

 

[TGV]

Nope, 110mph is for all stock in the London tunnels. They are too close to St Pancras to need higher speeds really.

Negative. Class 373 gets 230 on TVM from Kp6 in London tunnel 1 and maintain it all the way in tunnel 2 up to Southfleet until 300 voie libre is indicated, unless stopping at Ebbsfleet of course.

 

[D365]

Negative. Class 373 gets 230 on TVM from Kp6 in London tunnel 1 and maintain it all the way in tunnel 2 up to Southfleet until 300 voie libre is indicated, unless stopping at Ebbsfleet of course.

Why are 395s limited to 110mph; the wobbling issue? Don't suppose they'd go much faster there though.

 

[notadriver]

They aren't limited to 110. I dont know where 377/5 got that idea from.

 

[Class377/5]

Does anyone actually know what the limits are then? No-ones actually been able to say that.

 

[TGV]

60 out of [stn]STP[/stn], then 200 starts just inside the tunnel mouth (acceleration permitting of course), then as stated, 230 from KP6 onwards. 300 from between Ebbsfleet Stn and Southfleet junction if you're in something that goes that fast. 270 through Ashford.

 

[466.networkers]

140mph is the maximum speed of a Class 395 on HS1 (where permitted obviously!)

HTH

 

[Bald Rick]

Nope, 395s are permitted 250 km/h on open sections, but they only tend to use this if running late.

 

[TGV]

Nope, 395s are permitted 250 km/h on open sections, but they only tend to use this if running late.

That doesn't sound right. The 250km/h is 155mph. They have only ever claimed 140mph (225km/h) maximum. I'm willing to be corrected with suitable evidence.

 

[D365]

395 high-speed service is timetabled for 125mph, drivers only use 140mph when running late.

 

[notadriver]

I don't think that's the case.

 

[MCR247]

I believe the services are timed for 126mph running in the timetable. But there is nothing actually stopping a driver from running at 140 and just waiting at stations?

 

[HSTEd]

Based on a dataset recovered from a GPS recording one of the bashers on this forum made on a Cl395 on HS1... I estimate that on level terrain a Class 395 would reach 200kph roughly 4750m downrange after approximately 2 minutes and 6 seconds.

So it should easily reach 200kph or more in the tunnels.

 

[colchesterken]

We need a driver to settle this once and for all. In the summer I did a test run in my coach were two drivers going on or off duty. So I asked them about speeds. I had read in one of the rail mags that the service was timed at 125, 140 only to catch up
They said no it is 140 mph service all the way. I did not believe them
That seems to be supported by prev. posts here

 

[notadriver]

Well I've had many cab rides and it's 140 mph (225 kph) where gradients allow.

 

[starrymarkb]

Well I've had many cab rides and it's 140 where gradients allow.

mph or km/h - this thread is full of mixed units!

 

[scotsman]

Well I've had many cab rides and it's 140 where gradients allow.

I do not believe you on your first claim (that you have had many cab rides).

 

[ralphchadkirk]

When I accompanied a driver down to Ashford and back it was certainly 140mph for some, if not all of the way.

 

[Bald Rick]

That doesn't sound right. The 250km/h is 155mph. They have only ever claimed 140mph (225km/h) maximum. I'm willing to be corrected with suitable evidence.

You're quite right, I was confusing myself in metrication.

 

[notadriver]

I do not believe you on your first claim (that you have had many cab rides).

Why don't you believe me?

 

[D365]

You're quite right, I was confusing myself in metrication.

Can we all agree to use either metric or imperial on this thread? Miles are cooler imo

 

[TGV]

Can we all agree to use either metric or imperial on this thread? Miles are cooler imo

...but everything on HS1 is metric. No miles, no chains. All km and signalled in km/h.

 

[D365]

...but everything on HS1 is metric. No miles, no chains. All km and signalled in km/h.

I know, but miles are still cooler :P Try to stick to km/h guys? And always give the unit! God help if you forgot them all in my Physics exams...

P.S. Pretty much everything built to continental standards (i.e. HS1/2) is or will be metric. I'm trying to stop the metric vs imperial arguement that isn't happening! We hope.

 

[HSTEd]

Not as bad as the US.

There they have two official values for the foot.... because when they partially metricated the foot they defined a "survey foot" for the purpose of not having to redo all old maps.

ANd then there is the whole thing about the ounce of feathers being heavier than the ounce of gold.