[Coolhand101]

Most of my time in OR is getting performance figures spot on and adjusting the physics from my MSTS trainsets.

However while testing, i've never had a coupler break in OR. In MSTS, the break couplings were set way to high, but im not sure of what figure to use for real world values.

Example in ENG and WAG files:

126 ton, 3250 hp Diesel Engine, the chain coupling is 'Break ( 1.1e9N 1.1e9N )'

45 ton, loaded coal hopper wagon, the chain coupling is 'Break ( 3.2e9N 3.2e9N )'

The break figures are from MSTS.

Any ideals ?

Thanks

[Hamza97]

Don't know the ideal value for ORTS, but passenger cars used here on IR have a rating of about 75t or 735.35kN... :)

[Coolhand101]

Hamza97, on 04 April 2016 - 07:49 PM, said:

Don't know the ideal value for ORTS, but passenger cars used here on IR have a rating of about 75t or 735.35kN... :)

I did found some coupler values for the hopper wagons which stated 35 tons. However when converting tons to kN, i wondering if the figure is correct, as Brake force tons to kN is a completely different figure for OR and MSTS.

[Hamza97]

I use following formula for converting Tons to kN:
Tons * 9.81 = kN.
Pardon me, but how can kN values for break and tractive effort be different...??

[copperpen]

My US automatic couplers on a test train have Break ( 1.61e6N 1.61e6N ) and they do break if those figures are exceeded.

According to a Wiki article the European buffers and chain system allow for a max of 3000-4000 (metric) tonnes total train weight or 3937 long tons max rounded up so logically a break value that can cope with 4,500 long tons train weight should be about right.

[Coolhand101]

Hamza97, on 05 April 2016 - 12:14 AM, said:

I use following formula for converting Tons to kN:
Tons * 9.81 = kN.
Pardon me, but how can kN values for break and tractive effort be different...??

60 brake force tons on a loco is not 588kN for the max brake force in OR and MSTS.

[Hamza97]

Some values for screw coupler limitations as used on Indian Railways:
Level - 7000t
1 in 500 - 5000t
1 in 200 - 2800t
1 in 150 - 2250t
1 in 100 - 1700t

[steamer_ctn]

Coolhand101, on 04 April 2016 - 02:36 PM, said:

126 ton, 3250 hp Diesel Engine, the chain coupling is 'Break ( 1.1e9N 1.1e9N )'

These values are way too high.

1.1e9N = 1000 MN = 1000000 kN

If you look at this page, there are three documents(at bottom of page) for reference (Australian and British), and both of these documents indicate values in the range of 0.15 - 3.0MN depending upon the vehicle type.

The drawgear capacity will also vary with the age of the rolling stock. Older rolling stock did not need capacity values as high as modern long trains, as wooden wagon designs did not encourage the operation of long trains so high drawgear capacities were not required. So older stock appears to be at the lower range (0.15MN), while modern stock appears to be at the higher ends of the drawgear capacity. The article on evolving coal wagon describes the changes in Australian coal wagon drawbar capacities over the years as an example.

[Coolhand101]

steamer_ctn, on 05 April 2016 - 03:58 AM, said:

These values are way too high.

1.1e9N = 1000 MN = 1000000 kN

If you look at this page, there are three documents(at bottom of page) for reference (Australian and British), and both of these documents indicate values in the range of 0.15 - 3.0MN depending upon the vehicle type.

Many thanks. I missed the links at the bottom of that page.

The HAA wagon coupling force is 35 tons. The conversion calculator on that page also confirms this figure is indeed correct at 349kN for OR.

[Hamza97]

Just for my confirmation, the first value in break is for stretch and second for buffing. Or I have missed something....??