Author Topic: The Great Divide  (Read 1003 times)

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Leggy

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The Great Divide
« on: September 20, 2023, 09:12:41 AM »
+9


So the photo should give some things away, like this isn't American  :scared:

It's been many a year since I last posted about the rolls off the tongue oh so easily named Great Divide Railway & Mining Company, GDRMCo or GD for short. The GD has been a part of my life since I was 5 and in the 27 years since I've managed to build benchwork. That's it, benchwork and that was a decade ago now  :facepalm:



This image is a good illustration to the journey the GD has taken in model form.
From the front to rear:

The N scale GDRMCo Iron Ore. A small fleet of 9x SD70Ms and 9x SD80MACs (total was 15x but only 9x were painted) made up the start of a heavily Pilbara inspired rendition of the concept. But there was always something that niggled at me, no marker lights and no lower horizontal handrail per Australian standards. So where to? HO!

The HO scale version retained the same livery and was to repeat the same roster with SD70MACs to replace the SD80MACs, a total of 1x SD70M and 2x SD70MACs wore the livery before that came to a grinding halt. Last I knew a gentleman in the US possesses all 3x after I sold them years back and I hope he's gained the enjoyment from them I was hoping to. If Brian Kuhn (flight2000) is still rumbling around these forums, thank you again for your work sir!

Between the SD70s and what I'm doing now I revamped the concept to meet a couple of desires:
-Reduce the scope of the railway to something manageable and by this I mean move on from the original 1200km long line that paralleled the real Great Northern Railway line of the Queensland Railway to a railway line about 100km long set a bit further north up the coast from the original port. Map below.
-Use Australian equipment. The biggest thing I remember growing up are the details on our locomotives and having to add these to US models seemed like a bigger challenge than just using what we already have here. Out with the SD70s and in with local build GT46C-ACe locomotives (Australian body SD70ACe) and that's the blue and white loco up the back.

So the map!

From roughly Coorumba to Mungalli is the steepest part of the roughly 1300m climb from port to the mine near Ravenshoe (Ravens-hoe). While a 3'6" narrow gauge railway has been considered for this a standard gauge railway isolated from the state railway isn't a huge issue, all the GD hauls is magnetite ore and everything it needs can be delivered to the port by ship. So, on to the track plan...


(I've not finished the scenery part of the design, so many trees to add....)

This plan is designed around the desire to model the mine to port cycle of ore operations with as much 'spaces between places' as the space will allow hence the 3x levels. Operationally trains will run cycles from the port up to the mine, load and return to port to unload. While this is quite simple in theory with a couple of trains in operation and only one siding between it should be somewhat interesting.
Mixed in amongst this is the twice daily fuel train to the mine consisting of 7x tankers, along with a daily supply train with boxcars and gons loaded with material needed for the mine. I work on diamond drill rigs and have visited many mine sites in my time, there's alot of 'crap' that shows up reguarly mainly parts to keep the machinery running, construction supplies for expansion projects, etc so this will be at most a 6x car train, at the least it'll be a couple cars tacked on to the fuel train for it to deliver.
Last but not least, the occasional MoW train shutting the whole place down to lay new ballast, replace ties or rail, or just have some blokes standing around leaning on shovels while one poor sod does all the work.

As far as the layout is concerned here's some details in that tried and true form:

Track: Peco Code 75 Concrete Sleeper
Turnouts: Peco Medium Radius
Minimum Radius: 660mm is the aim, 770mm or more where possible
Maximum Grade: 3%
Minimum layout height: 1100mm
(Sorry I've no idea about Imperial measurements!)
Era: The present, ala Utah Belt.

The aim is to start work on this layout and have atleast benchwork ready by years end but it'll be squeezed in while I'm on breaks from work (I work 4 weeks on/2 weeks off) so progress may be slow  :ashat:
« Last Edit: September 20, 2023, 09:57:30 AM by Leggy »

Scottl

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Re: The Great Divide
« Reply #1 on: September 20, 2023, 09:26:10 AM »
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Neat prototype and layout plan.  With the space you have and three decks, you will have a lot of space to stretch those trains out.

How is the explosive brought to the mine?  As bulk ammonium nitrate in hoppers or smaller amounts?  I've always wondered.

Leggy

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Re: The Great Divide
« Reply #2 on: September 20, 2023, 09:39:54 AM »
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Smaller amounts, at the last mine I was at that was a similar size to what I imagine the Ravenshoe mine to be it was a weekly (if that) B-double semi to a storage and preparation area near the mine.

Scottl

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Re: The Great Divide
« Reply #3 on: September 20, 2023, 09:43:29 AM »
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Great, thanks. 

Ed Kapuscinski

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Re: The Great Divide
« Reply #4 on: September 20, 2023, 10:08:13 AM »
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Very cool! Australian railroading is definitely bad a$$.

Cajonpassfan

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Re: The Great Divide
« Reply #5 on: September 20, 2023, 10:44:49 AM »
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Quite the Project!
Are you planning on a continuous grade with helices to add elevation gain, or more or less flat decks with most of the gain in the helices? And what kind of elevations and vertical separation between the three levels are you contemplating?
Nicely rendered, btw.
Otto K.

Leggy

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Re: The Great Divide
« Reply #6 on: September 20, 2023, 11:13:33 AM »
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Working on exact heights for each level, the amount of rivers and creeks the line has to cross gives a bit of 'negative height' below rail level so that will need to be factored in. The plan is a gentle gradient across the middle and upper levels with working areas being flat.

chessie system fan

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Re: The Great Divide
« Reply #7 on: September 20, 2023, 08:04:14 PM »
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For the lazy, the main room works out to 31ft by 8.8ft.    ;)

I like the yard design.  It's simple, but different.
Aaron Bearden

EJN

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Re: The Great Divide
« Reply #8 on: September 21, 2023, 02:39:39 AM »
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Quote
(Sorry I've no idea about Imperial measurements!)

mm/25.4 = inches

inches/12 = feet

nkalanaga

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Re: The Great Divide
« Reply #9 on: September 22, 2023, 02:12:17 AM »
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Close enough, 300 mm = 1 foot.
N Kalanaga
Be well

Leggy

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Re: The Great Divide
« Reply #10 on: September 22, 2023, 08:47:27 PM »
+1
For the lazy, the main room works out to 31ft by 8.8ft.    ;)

I like the yard design.  It's simple, but different.

Growing up in a metric country and having a poor grip on fractional maths, yes I prefer the metric system and work with it but I'm not totally averse to Imperial. I believe it's 31'2" by 8'10". (We use both on our drill rigs as alot of what we buy is from the US)

As for the yard in Mourilyan...it, the port yard, Wooroonooran and the Ravenshoe mine trackage were designed by Rob Chant of jomrd.com for a previous plan he did for me, I've taken those elements and combined them into this version of the plan. And I'm going to call the render done:



I'll be using the trees for view blocks to break up scenes and areas and hide trackage disappearing into the helix. The lower level will be flat trackage wise but the terrain in the real world area of Mourilyan has small dips and 'mounds' so the trees around the track vanishing into the helix will be more of a 'tree tunnel' there.

The middle level is really the meat of the climb but I'll keep it more towards a 1.5-2% grade thru the Johnstone River Valley (all four of the rivers are part of the same Johnstone River system) with the grade fading out to a flat section for Wooroonooran with a return to climbing to the helix. Tunnels here are more appropriate so portals stuffed into tree covered hills works.

Up on the upper level the climb from the helix to an area near the trees along the fascia 'east' of Ravenshoe will be a bit more gradual, around the 1% mark. I've always wanted a 'big bridge' scene so the large curved trestle at Nandroya will be as much a passion project as anything and will likely mean the upper level will be towards the 1800-1900mm mark at the railhead. I'm 6'2" (ha Imperial) so this sort of height will be close to eye level and hopefully give a great view of trains flying above the trees. If anyone else has visited mine infrastructure you'll know even the smaller facilities are still huge compared to us hoomans so being at or near eye level will help give that feel of being an ant beside a steel monster when looking at the Ravenshoe ore concentrator. I will build a movable step to make operations easier at Ravenshoe however.

Lemosteam

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Re: The Great Divide
« Reply #11 on: September 23, 2023, 11:59:02 AM »
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Close enough, 300 mm = 1 foot.

You would be 4.8mm (~3/16”) shy for each foot. 12”” =304.8 :trollface: :D :D