Class 8xx permitted speeds

[superkev]

Hi
I'm sure this may be covered on one of the various 8xx threads.
Watching the excellent Don Coffey 185 cab ride from Hull to Man pic I was stuck by it being limited to 75mph where sprinters were allowed 90mph
I wonder where the class 8xx multiple units are with the various speed signs like SP (sprinter), MU, HST and more.
K

 

[swt_passenger]

80x use HST differentials. Was explained last month:

What are HST speeds applicable to?

From Oxford Parkway to Bicester (and beyond to Bletchley) is 75/HST 100mph. It will see 10tph (both ways) when you add in 2tph to MK and 1tph to Bedford; 11tph with freight. Why are we creating HST speed boards for this route? The only section ever likely to have seen a HST will be Oxford to...

www.railforums.co.uk

 

[Domh245]

They also qualify for MU differentials (where these exist), but not Sprinter as I understand it

 

[Efini92]

Hi
I'm sure this may be covered on one of the various 8xx threads.
Watching the excellent Don Coffey 185 cab ride from Hull to Man pic I was stuck by it being limited to 75mph where sprinters were allowed 90mph
I wonder where the class 8xx multiple units are with the various speed signs like SP (sprinter), MU, HST and more.
K

185’s have lots of restrictions due to their weight and large unsprung mass. They can’t run at any of the higher differential speeds e.g SP,MU,DMU,HST,EPS.

 

[superkev]

80x use HST differentials. Was explained last month:

What are HST speeds applicable to?

From Oxford Parkway to Bicester (and beyond to Bletchley) is 75/HST 100mph. It will see 10tph (both ways) when you add in 2tph to MK and 1tph to Bedford; 11tph with freight. Why are we creating HST speed boards for this route? The only section ever likely to have seen a HST will be Oxford to...

www.railforums.co.uk

Thanks.
I thought they were more a multiple unit than an HST.
Do 8xxs use the Hull Micklefield line? If so perhaps some new signs are needed where they are restricted to 75mph, sprinters are allowed 90mph and line is signalled for 100mph.
K

 

[Efini92]

They are a multiple unit, although I don’t sign them I would imagine they can run at MU speeds as well. The HST speeds covers a broad range of trains even including 158’s & 170’s.

 

[yorkie]

Thanks.
I thought they were more a multiple unit than an HST.

MU differentials are for weight purposes; HST differentials are about improved braking performance.