Talk:BR Standard Class 9F

message: I've added some details about Evening Star's naming ceremony including a part of the speech - this is transcribed from a BBC audio recording made at the ceremony, but, as I'm relatively new to all this, I'm not sure how to cite it - can anyone help? Andywebby 17:06, 30 December 2006 (UTC)
thread_title:  Naming ceremony 

message: The RA of 9 and axle load of 15.5 Long tons does not seem correct - particulary with the BR (WR) Blue designation.
I have seen a note that the RA classification on the Eastern region ER was different - so was RA region dependent?
Clarification and additional information would be very useful.  — Preceding unsigned comment added by 20.133.0.13 (talk) 17:07, 23 January 2014 (UTC)
replies: text: The GWR colour code was based on static axle load (i.e. it takes no account of rotating and reciprocating masses which cause hammer blow); and it also ignores wheelbase, etc. The RA system is the same for all BR regions, and the determination is based on dynamic load, and also takes other factors such as wheelbase into account. There is thus no direct conversion between the two systems. --Redrose64 (talk) 17:46, 23 January 2014 (UTC)
replies: text: Thank you for the information. The article on RA system could be expanded to include this as it primarily diesel/electric biased, no steam. The information about rotating and reciprocating masses above is interesting, but the implication for this loco is that these forces were large. This may due to the small driving wheel diameter for the 9F? Wouldn't this result is poor ride and/or increased wear to the bearings, springs and other load bearing items? Is there anywhere I can read more on this subject? Thank you.  — Preceding unsigned comment added by 20.133.0.13 (talk) 13:19, 24 January 2014 (UTC)
replies: text: Try hammer blow. --Redrose64 (talk) 14:03, 24 January 2014 (UTC)
replies: text: Thank you.  — Preceding unsigned comment added by 20.133.0.13 (talk) 14:22, 27 January 2014 (UTC)
thread_title:  Route Availability 

message: Although it says that the BR Standard Class 9F Locomotive were the last class of steam locomotives built in the United Kingdom, Wikipedia also says that the last Hunslet Austerity Tank Engine was built in 1964, four years after the last 9F Evening Star was built in 1960. Could someone explain this to me to clear up this confusion? --75.68.122.13 (talk) 14:42, 1 February 2015 (UTC)
replies: text: The article says that Evening Star was the last locomotive built by British Railways. The later Austerities were built by Hunslett (mainly for the NCB). Robevans123 (talk) 15:19, 1 February 2015 (UTC)

text: It says they're the last to be built by British Railways, although "last mainline locos" would work too  (I'm not going to split hairs over Tornado). Andy Dingley (talk) 15:21, 1 February 2015 (UTC)

text: It doesn't say "the last class of steam locomotives built in the United Kingdom": it says "the Class 9F was the last in a series of standardised locomotive classes designed for British Railways during the 1950s", "the last of the class, 92220 Evening Star, was the final steam locomotive to be built by British Railways", 'the last member of the class was constructed at Swindon in 1960, the 999th "BR Standard" to be constructed, and the last steam locomotive to be built by British Railways', and "the last steam locomotive constructed at Swindon". --Redrose64 (talk) 15:22, 1 February 2015 (UTC)
replies: text:  Thanks for clearing out the confusion. Although the artical should say there were more steam locomotives built in the UK after Evening Star in 1960. --75.68.122.13 (talk) 14:54, 2 February 2015 (UTC)
thread_title: Really the Last Steam Locomotives Built in the United Kingdom?

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thread_title:  External links modified 

message: I changed "one of the most powerful built in Britain" to "one of the most powerful built for British Railways" as Beyer Garratts built in Manchester for South African, East African and Australian railways were far more powerful. 9Fs were quite weedy in comparison.
For example, 
9F tractive effort	= 39,667 lbf
EAR 59 class        = 83,350 lbf  — Preceding unsigned comment added by 116.48.246.243 (talk) 07:47, 6 April 2020 (UTC)
replies: text: Tractive effort is not a measure of power, but of the theoretical force applied when starting from rest. Power is proportional to force multiplied by velocity; hence a locomotive at rest develops nil power; and as velocity increases, so does power. But at the same time, the flow of steam through the system will increase with velocity (notwithstanding the effects of varying the cutoff), and above a certain flow rate, the ability of the boiler to generate steam will reach a limit and the boiler pressure will drop with a consequent drop in tractive effort. See Tractive force. --Redrose64 🌹 (talk) 16:03, 6 April 2020 (UTC)
thread_title:  Not one of the most powerful steam locos built in Britain 

message: so since its been a year or so since 92212's boiler ticket expired, does that mean its awaiting overhaul?
73.250.53.193 (talk) 16:01, 21 August 2021 (UTC)
thread_title:  question