NEW BUILD - Doncaster P2 Locomotive Trust (streamlined version)

Blimey, you mean they've found a source of imperial steel? :whistle: I would have thought most of the drawings would have to be re-drawn anyway, the cylinder casting size can't be that critical and cutting the frames as one piece must be better in terms of accuracy and integrity. Buffer beam brackets? Nope, don't see how those would be difficult to adjust.....

With regard to the Swindon locos, the extension frames are a somewhat different beast....

Foxy

 

Showing my ignorance of copper capped stuff - I thought they were constructed from some great Swindon car boot sale!

However my comment about having to re-draught the drawings and hence the opportunity to design out a weakness still stands.

 

I don't see the problem in updating and modifying as necessary to meet modern construction standards and likely operating conditions. It's going to be a replica and has no great historical significance. But this old codger would like to see it, being too young to see the originals.

 

I wish!

I've played a small part in the construction of the Standard 3MT's frames so I'm aware that the current metric steels are not an exact match for the previous imperial. But the stretchers, cylinders, etc. are made slightly oversized and then machined down to give the exact distance across the outer faces of the frames, after carefully measuring these, and small discrepancies can be accommodated. An inch each side is not a small discrepancy!

I don't recall saying that redrawing was not possible; the question was what were the advantages of retaining the original spliced frames. That remains the case.

 

If its going to be a replica will it have a monobloc Cylinders/valve-/steam -chest casting like the original ? That would be phenomenally expensive if you can find any one willing/able to make it ?
in which case it really does need single piece frames as a load of bolts/ rivets in the area where everything knits together isnt going to help...

 

I assumed that they would not use the monoblock cylinder casting, but if they do it makes the situation much worse. There is a 'groove' each side of the middle cylinder to accommodate the frames' passing through. Moving this groove would be a far more difficult job than simply shrinking / expanding seperate cylinders, although each of these would need completely new drawings.

 

I regard 60163 as a steam locomotive.

 

Maybe they should consider a tender redesign and include space for a 42u server rack and ups system required for ERTMS ? (accessed from the rear via a gangway along the design of a corridor tender connection would do it ?)

 

cock o` the north has already bin taken by the 9f at the north Yorkshire moors railway.

 

I think you'll find that Cock O' The North was originally taken by an NBR Atlantic (LNER 9903), then the Gresely P2 no.2001, followed by the BR Class 87 no.87022 and finally 9F no.92214 so the NYMR loco is simply the most recent example of the name.

 

Touche, sir - touche!

 

Having looked at the drawings, I was astounded that they have been done in imperial measurements. They'll get no support from me!