Torbay Express 9th September 2007 part 1

34067 Tangmere Struggles with the first leg of the Torbay Express, but no problems on the return

Category:

Autos & Vehicles

Tags:

• 34067
• Tangmere
• Torbay
• Express

[justandy333]

vtdimitrov,

Why would this be a true ecological disaster?

Its a couple of steam trains, not an oil spill!

[palmerstonian]

Combination of poor handling and a locomotive not intended (or designed) for this kind of duty. Should have had a banker or pilot locomotive from the start.

[Benjy5997]

@ryskinner Yup. they just stuck a class 25 Diesel on the rear of the train to save this from happening again

[HSTgreat]

fantastic video. definate like and fave for me :)

[herbgarratt]

@herbgarratt

CGT, I am the first to agree with agreeing to disagree (private exchange). But, valve timing, in circs like this, is VERY important. Tractive weight matters a great deal, but its undeniable gifts may be ruined by unwelcome spikes in the torque curve. THESE are the moments when traction is lost, and from that nano-second onwards, one is on the back foot.

Small drivers, as you rightly say, have no especial relevance.

[EBN666]

Großartig!!!!

[CGT867]

@herbgarratt We will have to agree to disagree on this. All I can add is that Australia and the USA have far heavier grades to start trains on than the "almighty" Great Western and they put Walshaerts on all their modern (and very sucessful) heavy freight locos so it can't have made much of a difference.

[herbgarratt]

@CGT867

Your surplus of exclamation marks, and indignation tell me that you are less than well-versed in the topic.

In this circumstance, wot matters is tractive weight (yes, the 2-8-0T has an advantage), and valve timing.

Small drivers have nothing to do with anything, as large drivers can easily be compensated for with stroke, and/or diameter.

Walschearts is cursed with a constant Lead, and in these circs,and only these circs, Stevo leaves it for dead and that's why the GWR stick with it.

[CGT867]

@herbgarratt . The answer to both your questions is "it doesn't matter". The point you have yet to concede is that the tractive effort of the small drivered 8-coupled tank is much greater than that of the pacific - thus it's ease in lifting the train even if it had Walsheart's valve gear!!!!!

[herbgarratt]

@CGT867

1. Wot is the aggregate weight on those drivers, vis a vis the STE?

2. Do both the engines you quote have the same Lead.

Yawn (excuse me!)

[CGT867]

@herbgarratt. If you compare A Stanier 8F 2-8-0 and a Stanier 5MT 4-6-0 both have Walshearts valve gear, both have the same boiler pressure, 2 cylinders, same bore and stroke - yet the 8F has 27% greater tractive effort due to its eight 4 foot 8 1/2 inch drivers against the six 5 foot 6 inch ones! And that is ALL this video shows - the advantages of 8 small driving wheels vs 6 large ones!

[GrrMeister]

Fantastic wish I had been there - well done