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MR Johnson 1134 Class Saddle Tank yard shunting engine


k22009
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This class of eventually 10 engines all built at Derby in 1897 and 1903 were slightly bigger than the other 1322 and 1116 class engines. The last was scrapped in 1958. They had various cab arrangements, open back and fully enclosed both with open sides, during BR days even had a fully enclosed cab with sides extending up from the bunkers. There are not many photos of these so i've added one from Midland Locomotives vol 3 Essery and Jenkinson. 

 

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The difficulty i had with these etches was trying to utilise a standard gearbox (High Level)/small motor (Mitsumi) and still hide everything. In the end i decided to have a removable saddle tank with smokebox, a lower removable boiler section that fits underneath and around the motor and a separate rear firebox fixed in situ that will hopefully all join together upon assembly. We'll see.

 

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On the etch i've provided for either the open back or full cab variations, i'll probably go with the full version.

 

Dave

Edited by k22009
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13 hours ago, Asterix2012 said:

Just out of curiosity what version did K’s do?

 

The only model i've seen in 4mm is the one pictured in this old thread. I'm not sure of the provenance of that model, whether it was was scratch built or from a kit though? 

 

 

Dave

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Chassis up first, i'm going to use a simple compensation on this chassis, the front drivers will sit in horn blocks, the spacer just behind them has a slot in it that the L shaped piece sits in and will act as a pivot point. I've used High level slimline horn blocks, they fold up and fit as with everything from Chris just perfectly. 

 

20210707_141000.jpg.8153892b48144c8c429dd207c31a3e71.jpg

 

With the coupling rods made up and utilising the spring on the axle jig to retain the guides against the frames the coupling rods ensure the spacing is perfect before soldering them in place.

I like to make the spacers as wide as possible so the bearings are assembled with the collar on the inside, there will probably be one M3 nylon washer between the frame sides and wheel as side play isn't really an issue here.

 

20210707_170538.jpg.e4d02e821f2092dc546fa4c4e52d7ea2.jpg

 

20210707_170543.jpg.cba2581dfa14713e677f88ee53960c9c.jpg

 

You can see the pivot point under the spring this was soldered in place to the frame spacer after removing the jig and springs.

 

The valences and buffer beams have been fitted to the footplate  and the chassis test fitted under to ensure the locating/body fixing holes in the spacers line through.

 

20210707_180241.jpg.005fafad903be7364d755c537f2a444a.jpg

 

Cab next.

 

Dave

Edited by k22009
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This 1134A class one is made from a line drawing produced in 1953 of 1523 by Geoff Della Gana and was measured on site at Burton-on-Trent. Apparently 1516 was also stabled there at the same time. These 2 being the last working examples in their respective class.

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I've added a full size cab forming template onto the drawing so that it's easier to check the profile against when forming the full or half cab. There are also 2 stiffeners that can be added for the full cab to assist in getting the bends in the correct position.

 

20210708_171608.jpg.fd58dd0525676e2fff872e48a957900b.jpg

 

The full cab rear sits on top of a backplate at the rear of the footplate with beading sandwiched between the 2. The beading will provide a location for the cab handrails to fit to.

 

The cab front has 4 small rivet strips to add that run down to the firebox top and the rear has 2 heavy duty stiffeners to add that would have supported the upper formed profile, i'll add those though once fitted to the footplate as they fit onto the rear buffer beam.

The small lip at the base of the cab front will have a nut soldered onto and provides the rear chassis fixing point.

 

20210709_112239.jpg.a369d45c08c9f796f3bc9fc37f2320b1.jpg

 

The bunker sides have had the beading attached to the top and the cab floor has been sweated onto the footplate. I'm not sure if this was planked but that's how i've had it etched. 

 

20210709_115802.jpg.a51b32005500028274cba9518c0ff6b6.jpg

 

 

Edited by k22009
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The springs are 2 parts laminated together and they fit into slots in the footplate along with the reversing rods/lever which from photos are both sides, I'm not quite sure how it operated?

 

The cab has had the rear stiffeners added after positioning on the footplate along with the lamp irons. The cab rear fits into locating tabs on the footplate and the front is located by the chassis fixing point.

 

20210709_125730.jpg.941e3bfcc7de50a9ae1ba0d4755e46c5.jpg

 

20210709_165031.jpg.162c7cf2c0f0767013d2e2ab6b6554de.jpg

 

I moved onto forming the boiler bottom piece and the firebox. The boiler bottom has a nut soldered into the one end so that it can be slid under the motor when assembled and fixed in position from the underneath by an independent screw seen roughly in line with the centre of the front springs, the one forward of that will fix the chassis to footplate and into the smokebox. The firebox has a rear former with 2 off 1mm dia holes for locating into the cab front which i need to add before fitting this permanently to the cab front the rest is clear to allow access for the gearbox.

 

20210709_171848.jpg.f23ea08f68550976622e699a40d3d075.jpg

 

Hopefully the gearbox will sit inside the firebox and the motor will then be contained with the boiler section on the bottom and the saddle tank to the top all hidden from the outside world. Well that's the plan.

 

Saddle tank forming next.

 

 

Edited by k22009
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16 hours ago, k22009 said:

 the reversing rods/lever which from photos are both sides, I'm not quite sure how it operated?

 

 

 

 

 

 

 

 

I've never noticed this before but I've never had to build one either....

There's a back photo of 1518 in Essery and Jenkinson which shows what appears to be a reversing wheel on the LH side and lever on the RH side in the normal MR position. Quite why a little shunting tank should need a screw reverse is beyond me though - and it must have been possible to disconnect the screw reverse at least.

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3 hours ago, Michael Edge said:

I've never noticed this before

 

Summerson is silent on this point.

 

But, looking at photos, what I notice is that the rod on the RHS reaches to roughly mid way between the wheels, which would be about the right place for the motion (plus this is the driver's side) but that on the LHS is linked to a lever just ahead of the brake hanger for the rear wheels, so I suggest it had some their function.

 

I wonder if @Dave Hunt can shed any light on this?

 

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It must be the handbrake in that case, the brake arrangement was a bit peculiar on these locos.

Looking through Essery and Jenkinson again there's a good side photo of 1514 and what looks like a reach rod on the LH side operates a short lifting link in line with the centre of the wheelbase. This may well have been to lift and push apart the brakes in the original design. It probably didn't work very well and the lower photo of 1518 on the same page shows the same rod arrangement with a steam brake cylinder as well and presumably internal linkage to the brake pull rod and conventional brakes.

In other photos it can be seen that there was a cross shaft with a lifting link and steam brake cylinder on both sides. The actual reach rod (for reversing) on the RH side is a bit further back, behind this cross shaft.

There's no other handbrake visible, I have to admit I was fooled by the similar appearance to a reversing wheel!

Pictures would make this clearer but I can't put them in here for copyright reasons.

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As far as I know there was no GA was issued for the larger 0-4-0 saddle tanks but one was produced (drawing No. 83-1890) for the smaller engines. This was available from OPC so now should be obtainable from the NRM.

 

In the meantime please find two scans from 83-1890 shewing the purpose of the two 'reach rods'.

 

Hopefully they will be of use - I believe both sizes of saddle tanks had the same brake arrangement.

1367972114_O.341-I.jpg.d7454d601ddfaa3bba6de41f27acef9d.jpg

 

 

 

 

1947856850_O.341-II.jpg.6ba8a9ec364e5cb820efeab682464ecc.jpg

 

Apologies for them being upside down and one being canted.

 

 

Crimson Rambler

 

 

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21 minutes ago, Crimson Rambler said:

Apologies for them being upside down and one being canted.

 

I used "Interesting/Though-provoking" rather than "Informative/Useful" since, whilst I am sure these drawings are the latter to the initiated, I'm contemplating the unwisdom of standing on my head straight after dinner. But I think this shows - bottom one best - that the short, LHS, rod works the brakes?

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1 hour ago, Dave Hunt said:

In the Melbourne a few miles south of Derby then?

 

Well, that's the Melbourne from which William Lamb took his title, even though his viscountcy was in the peerage of Ireland, and then lent it to the Victorians.

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It never ceases to amaze me what information is available from the membership on here, the help and assistance is always gratefully received. Thanks.

 

The saddle tank was formed after a bit of a wrestle, but with the use of the rolling bars and a few small steel bars to get the smaller radius corners to match the formers i got there. 

 

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The smokebox base formed and a nut soldered onto the inside before attaching to the saddle tank front. Here shown all assembled just placed in position for know.

 

20210710_161315.jpg.8639352c6c0369146a3b87db7f4730ba.jpg

 

20210710_161345.jpg.97ccc529cd6a10872dd3aef6ac5a88af.jpg

 

In the picture below you can just see the joint between the separate lower boiler and firebox, the firebox top extends under the saddle tank. Once the pipework is added that will hopefully be disguised.

 

20210710_161406.jpg.3f8bc53064edae4550ace602e4e84167.jpg

 

Chassis completion next and to see how the motor/gearbox fits. 

 

 

Edited by k22009
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