Ivatt 2-6-2 41312 photographed on shed at the Mid Hants Railway

[P A D]

About a year ago I had the good fortune to find 41313 parked up on shed, when I called in on spec to the Mid Hants returning from a business trip. I've been meaning to share the photos for some time, but overlooked to do so.

Dave Holt in his thread on his P4 BR Std 2 6 2 mentioned that these locos and the Ivatt version they were derived from, had a swing link pony truck at one end and a side control spring one at the other. This was something I was unaware of and this evening I had look through to see if any of the photos shos this which they do, albeit, the swing link truck is at the rear where the AWS is, so is obscured by the bash plate for the coupling.

Anyway I will, post them all and people can pick and choose if they wish to save any for reference.
I won't bother with captions as the photos speak for the selves, but if there are any queries I'll try to answer them.

 

[LarryG]

Although there were numerous design differences, the most easily spotted are the earlier Ivatt's which had guard irons attached to the main frames and not the trucks.

 

[P A D]

Set 2. There may be some that are very similar, but it's easier to post them all.

 

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Set 3.


Note that the pony truck images are all of the front which has the large side control spring.

 

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Set 4.

 

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Set 5.


See what I mean about the bash plate obscuring the rear bogie detail. There are some more to come which are from the side and you can just make out the swing links.

 

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Set 6.

 

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Set 7.

 

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Set 8.

 

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Set 9.

 

[Peter Cross]

Peter
Is there any pictures of the rear pony, or did I miss them.
Very nice set, could of done with some 3 years back when I built one.

 

[P A D]

Set 10. This is the final lot.
Hope you all enjoy and find them useful.
Cheers,
Peter


The swing links can just be made out in this side view of the rear piney truck. If I'd known at the time I would have made an effort to get a better shot showing the details.

 

[Dave Holt]

Peter.
Thank you very much for sharing this superb selection of photos. Lots of useful detail there which will be a great help with my 4 mm scale model, although one always has to be slightly wary of preservation shots in case the original has been changed for some reason (injectors on some Bulleid's, for example).
I've taken the liberty to add some further photos I took of the pony trucks whilst the loco was in bits and also a couple of the reverser, taken at Quainton Road, on one of the locos now on the IoW. Unfortunately, the original are prints, so I've had to scan them and then re-size, so the definition isn't as good as yours.
Hope these are also of some interest.
Reverser stand in the cab.



Swing link truck frames and "A" frame (same as spring control truck). The triangular blocks resting on top of the frame fit at the bottom of the horseshoe shaped pieces and locate the bottom end of the axle box suspension springs.



Spring control truck with control spring and bars missing.




Dave.

 

[P A D]

Hi Dave,
Thanks for posting these images, which are very informative showing details that cannot normally be seen when the loco is whole.
There was an article in the defunct Modelling Railways Illustrated many years ago and my brother dug it out for me this evening.
Here are the front and rear elevations and they show the swing link truck at the front, whereas 41312 has it at the rear. Some of the illustrations in the article show it af the rear also so maybe they were swapped around??? I didn't get a chance to read it but will do tomorrow, to see if it throws any further light on the pony trucks.

Cheers,
Peter

 

[Peter Cross]

I have a feeling they got swapped about. I don't think which end they were at made any difference to the running as long as both were different.

 

[P A D]

I'm not sure if Dave mentioned in his post why the pony trucks were of two types. I'll have a look back at his thread and also read the article to see if that throws any light on it.
Cheers,
Peter

 

[oldravendale]

I don't know whether you can see the underpinnings on any of these photos but they are of various 2-6-2 tanks when in service - or at least before preservation. All my personal copyright.


41284. Nine Elms Shed. 6 July 1967.


41312. Barry. 9 Nov 1968.


41312. Nine Elms Shed. 6 July 1967


41313. Barry. 18 November 1967


41325. Eastleigh Shed. 23 May 1965.



41324. Eastleigh Shed Yard. 23 May 1965

Brian

 

[P A D]

Unfortunately not Brian, but good to see them anyway. All grist to the mill.
Cheese,
Peter

 

[Dave Holt]

The LMS GA drawing clearly shows the swing ling truck at the front and the spring control at the rear. All the photos of these locos in main line service that I've seen, where the trucks can be identified, comply with the drawing. That's not to say there aren't such photos showing the other way round.
Perhaps the Mid Hants swapped them for some (or no) reason - even out flange wear? They are fully interchangeable so they can. As I said, be slightly wary of preservation shots.
The BR Standards always had the spring control at the front and swing link at the rear. Also applies to the 3MT tanks.
The reason for two different types is to avoid the risk of resonance which could occur with two identical trucks having the same natural frequency of sideways oscillation. The different trucks will have different natural frequencies and thus help to damp each other out.
Dave.

 

[P A D]

Hi Dave,
Thanks for the detailed explanation for the different trucks. I haven't had a chance to look at your thread yet to see if you mentioned it, so you had saved me the trouble.

The article in Modelling Railways Illustrated only mentions the following re the trucks.


As to which truck was at the front and which af the rear in service, it sounds like they were swapped around. An illustration in the article shows 41321 in May 1961 with the swing link to the rear. 41284 is shown in March 1966 with the swing link to the rear.

In LMS Locomotives V5, an undated photo of 41312 shows the sprung truck to the front, but none of the other illustrations are clear enough in this area to identify which trucks are running front of back.

Cheers,
Peter