MellishR's Recent Activity
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MellishR liked Steve's post in the thread V2 4771 Green Arrow to return?.
It would be interesting to see the income and expenditure cost of operating Scotsman. However, if the hire figures I’ve seen are correct then it should be cash positive at the end of its current ticket. Whether that money is put back into...
5. Lipanj 2026. u 14:02 -
MellishR liked 242A1's post in the thread V2 4771 Green Arrow to return?.
The fact that the overhaul of Flying Scotsman had to be undertaken twice is no fault of the engine. The people that are and were involved is another matter. Sir Nigel Gresley underwent an overhaul from 2015 and returned in April 2022. This is...
5. Lipanj 2026. u 14:00 -
MellishR liked Bikermike's post in the thread V2 4771 Green Arrow to return?.
In real terms, I suspect the full cost of the rebuild, nevermind the overrun will cost you around a penny (depending on your definitions of "cost" and "us"). If you've watched FS go through at full welly anywhere, I would submit you have had a...
4. Lipanj 2026. u 11:49 -
MellishR liked Jamessquared's post in the thread SVR General Discussion.
The Bluebell is indeed going down that route. My understanding is that a CCBS is a comparatively recent legal entity; Railways that set their structure 10+ years ago didn't have it as an option. It was explained at a recent-ish Bluebell meeting...
4. Lipanj 2026. u 07:42 -
MellishR liked Sheff's post in the thread 6024 King Edward 1.
I was an engineer in the chemical industry all my working life and firstly for our sins they were always referred to as vacuum pumps, be they recip, liquid ring or whatever. However, in design and specification, we always used absolute pressure...
1. Lipanj 2026. u 20:16 -
MellishR liked GW 5972's post in the thread 6024 King Edward 1.
I’m not going to comment on the cause of the squeak in case it leads to another forty posts!!!
1. Lipanj 2026. u 20:15 -
MellishR liked Wenlock's post in the thread 6024 King Edward 1.
It is labelled both Air Pump and Vacuum Pump. I suppose it could be called the "Vacuum Maintaing Air Pump" :) But what really matters is, why does it squeak? Is that a fault, or is it an indication of a good seal around the piston?
1. Lipanj 2026. u 20:15 -
MellishR liked Jamessquared's post in the thread 6024 King Edward 1.
Yes, but we’d also put a liquid nitrogen trap in the circuit between pump and vacuum line to prevent the pump oil absorbing volatiles and reducing the efficiency, and I’d like to see the Swindon drawing for that! Tom
1. Lipanj 2026. u 20:15 -
MellishR liked 26D_M's post in the thread 6024 King Edward 1.
To be further pedantic, the "pump" maintains the vacuum, created by a steam ejector, once on the move ....
1. Lipanj 2026. u 20:13
