Chinese National Railways RM Class Pacific

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ben racey
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Chinese National Railways RM Class Pacific

Post by ben racey » 06 Jul 2014, 22:47

So, filled with enthusiasm following discussion with Teamyakima and his ambitious plan to build a large Chinese exhibition layout, the other night I dug out various papers and was reminiscing about Changchun, and thought I’d finish off a long stalled project.

Changchun, by the end of it’s exhibition life, had three completed pacifics:

SL 681 – supershine SL pacific, one of Jiilin’s finest! Always my favourite engine, this was really the show pony of the layout - we had the pleasure of seeing one of these running on our visit, but sadly it was nowhere near the lovely condition they were in the late 80’s, so this one had to do for me:

SL7 – the streamlined preserved pacific, quite a beast….

RM 1093 – Bog standard RM pacific, once very common around Changchun – all gone by the time we were there.

But there was another, which was never finished, another RM pacific, which I started, but never got round to finishing by the time the layout was retired. I thought it might be worth digging it out of store afer near enough 12 years, and see if I could finish it off, to make it four pacifics!

All of these models were build using the IHC/Mehano pacific as a basis. Unlike the IHC 2-8-2(I built 2x JF using these), the pacific is pretty much exact for a RM/SL chassis and tender, and is a relatively easy conversion using the existing body, tender (chassis and body for the SL – pretty much as is!, tender chassis with new body for the RM). A few years ago these could be picked up for around £25 in the UK, they’re still pretty cheap, but a cost a little more now.

The photos show the stage the RM had reached before going into store. The tender is pretty much complete, just needs some ladders on the tender, rear lamp and some minor detailing and it’s good to be painted straight away.

The loco chassis had a lost wax brass cow catcher fitted, but was otherwise unchanged.

Loco body has had all of the detail removed, new chimney and skyliner casing fitted, part of the new cab and new running plates fitted. Some other basic details like handrails also added.

The key remaining parts to complete are the smoke deflectors, running plates to buffer beam, something round the cab, pipework and the boxpok wheels – all the IHC models are fitted with spoked wheels, and this is fine for some of the SL’s but not the RM – iirc this is what caused the project to stall and go into storage.

In the intervening period, I’ve made progress with using the developing technology of 3d printing to develop a projects, including the C4, and if I was starting from scratch, I may well have designed a complete 1 piece body to go on the IHC chassis. But, I intend to use 3d printing for a few of the parts, and take it forward as follows:

Boxpok wheels: Remove some of the spokes, and reduce depth of the others such that a 1mm thick boxpok overlay will fit in each of the wheels. This should work, retain the strength in the wheels as they are and give the full boxpok look

Running plate: 3d print a couple of smoke deflectors and associated running plate, in one piece, for strength – always a bit of a weak spot at the front of the SL.

Cab: finish off with plasticard, and maybe 3d print a new cab roof

Detail: Various brass, plastic and wire parts as appropriate, eg for the electric generator

Tender: A few details to be completed before being painted.

Anyhow, hope that’s of interest, I’ll post up a few pictures as it develops.

Regards
Richard.
Attachments
RM 1.JPG
RM 1.JPG (75.9 KiB) Viewed 3794 times

TEAMYAKIMA
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Re: Chinese National Railways RM Class Pacific

Post by TEAMYAKIMA » 06 Jul 2014, 23:48

Nice to think that my layout project has inspired you to return to modelling .......

Whilst my layout is set in 2004/5 your RM pacific is always welcome as a 'special'.

BTW you can see a full blog of my layout on RMWEB.CO.UK ... under OVERSEAS MODELLING

I will re-double my efforts to get my layout up and running in order to see your loco running on it!

roco
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Re: Chinese National Railways RM Class Pacific

Post by roco » 07 Jul 2014, 20:03

Nice work Richard but how is the status of the C4 ?

with kind regards Jos

ben racey
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Re: Chinese National Railways RM Class Pacific

Post by ben racey » 09 Jul 2014, 20:21

Thanks Jos!

Not good on the C4 I'm afraid. I have a prototype, however, it appears the boiler is much higher set than the PX48, so it's not a simple matter to get it right. So, haven't done much to it since I received the prototype, as I'm a bit stuck! IF anyone has any good photos of a C4, or even a drawing, they'd be very gratefully received!

Regards

Richard.

petit panda
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Re: Chinese National Railways RM Class Pacific

Post by petit panda » 16 Jul 2014, 15:58

Photos of C4 are scarce to find in books dealing with narrow gauge railroads in China.
Here is the sole photo of a C4 in Xibu depot that I found in the book "Industrial Locomotives of the Peoples Republic of China" compiled by R.N. Pritchard from the Industrial Railway Society.
C4 7216 at Xibu in 1991 r.jpg
C4 7216 at Xibu in 1991
C4 7216 at Xibu in 1991 r.jpg (243.21 KiB) Viewed 3732 times
C4 were used at least on the Meixian Provincial Railway with the following roaster in 1995 :
. 7004-7005
. 7107-7114
. 7215-7218
. 7326

R.N. Pritchard is mentioning in the text that the basis of the C4 was "probably" the Polish Px-48 class called BL class in China. This comment suggests that the C4 wasn't a simple copy of the Px-48 class but indeed a derived design.

Petit Panda

ben racey
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Re: Chinese National Railways RM Class Pacific

Post by ben racey » 16 Jul 2014, 20:42

Hi,

I hadn't seen that picture of a C4 before, only these ones:

http://www.johnathersuch.com/railways/c ... ailway.htm

BL50(PX48)
http://www.johnathersuch.com/railways/c ... ailway.htm

From the text, and my findings with the 3d model, it certainly seems as though the boiler sits higher on the frames than the PX48/BL50.

Maybe the front end of mine is right, and it just needs raising up at the rear?

Regards

Richard.

ben racey
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Re: Chinese National Railways RM Class Pacific

Post by ben racey » 06 Sep 2014, 19:27

Some good news....parts for the RM are on their way from shapeways. I've used the print it anyway option as some of the parts are quite thin - particularly the boxpok wheels and smoke deflectors! I'll post an update when I know how they've turned out....

Regards

Richard.

janetang

Re: Chinese National Railways RM Class Pacific

Post by janetang » 12 Sep 2014, 12:10

For C4 models can view this post:
viewtopic.php?f=84&t=417&p=1978#p1978

janetang

Re: Chinese National Railways RM Class Pacific

Post by janetang » 11 Oct 2014, 09:59

also you can visit here
viewtopic.php?f=35&t=425

roco
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Re: Chinese National Railways RM Class Pacific

Post by roco » 11 Oct 2014, 15:38

There are no steamlocomotives type RM and C4 on this website for sale .

wkr Jos

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