[Weter]

5-axled steamers as Эм by Ganz Mavag had wide ridgeless middle axle wheels too.

[systema]

Suggestions regarding the no of axles and bogies are given in my post above.

Mick Clarke

[steamer_ctn]

systema, on 27 September 2021 - 05:23 AM, said:

So far as wagons similar to Lacis shown above are concerned, would it be appropriate to consider the two vehicles the same, with a two axle bogey at one end and a single axle bogey at the other? There will be similar carriages to this in MidEastCoast, ie Gresley articulated wagons. The length between bogies on the one vehicle would be real and on the one with only two actual axles it would be nominally the same.

My initial thinking for articulated wagons is to consider them as two cars. The may share a bogie, in which case I suspect that this needs to be proportioned between the two cars.

I am assuming that the plan here is the same for the cars that you are looking at.

OR assumes that a car and its bogies are symmetrical, so it will be interesting to see how it copes with an asymmetrical car.

In this case, I would suggest that you use the following:

ORTSLengthBogieCentre ( 34.8ft )
ORTSLengthCarBody ( 52ft )
ORTSLengthCouplerFace ( 54.3ft ) (Use the coupler pivot points between each car to determine coupler faces.)
ORTSNumberAxles ( 3 )
ORTSNumberBogies ( 2 )

Don't forget to do the fixed wheel bases on the bogies as well.

Then try them in a few different scenarios, and let me know how they go.

[steamer_ctn]

To clarify the units for these new parameters:

ORTSWheelFlangeLength - Wheel flange length is defined as the length of flange starting from the beginning of the maximum flange angle to the point where flange angle reduces to 26.6 degrees. - Distance (m, in, ft, etc) - default is m

ORTSMaximumWheelFlangeAngle - Wheel flange angle is defined as the maximum angle of the wheel flange relative to the horizontal axis.- Angle (deg, radians) - default is rad.

[steamer_ctn]

For those interested the following documents have some helpful information on wheel profiles.

i) AAR Freight Wheels

ii) APTA Passenger Wheels

This accident report for CN might also be of interest to show that trains can derail on sharp curves if the conditions are right. It demonstrates a string-lining derailment. Railway companies have introduced different means of preventing these types of incidents. Some of these are the correct placement of empty cars in the train, the need for the driver to use smooth train movements and acceleration, etc.

[Laci1959]

https://kephost.net/p/2021/39/8100_9adc43c29d4e.png

Based on the image, I edit it in AutCad and try to record the two data. If you succeed I will publish because it is a UIC recommendation in Europe.

[Weter]

That's it! Thank for sharing.
It's curious, how parts are called.
Круг катания
Стопорное кольцо
Колёсный центр
Бандаж
Гребень
Поверхность катания
And what are notes?
Interesting, that new bandage has double cone: 1/20&1/40 on its surface.
That gives linear contact spot, decreasing resistance, but increasing friction/adhesion...

[rickloader]

May I suggest that a derailment is only obtained if the critical condition is sustained. It would be frustrating if a momentary instance of bad track alignment caused a derailment. So I suggest a timer is coded to record a derailment only if the condition continues..
With the limitations of our current sectional track and our editors, most routes have imperfect track joints,
I am not clever enough to follow all the reasoning in this thread, so please excuse me if actual derailments are not intended.
Rick

[steamer_ctn]

rickloader, on 02 October 2021 - 01:17 AM, said:

May I suggest that a derailment is only obtained if the critical condition is sustained. It would be frustrating if a momentary instance of bad track alignment caused a derailment. So I suggest a timer is coded to record a derailment only if the condition continues..

If you refer to this post you will see that your suggestion has already been incorporated in via the wheel climb time.

[Laci1959]

Weter, on 02 October 2021 - 12:57 AM, said:

That's it! Thank for sharing.
It's curious, how parts are called.
Круг катания
Стопорное кольцо
Колёсный центр
Бандаж
Гребень
Поверхность катания
And what are notes?
Interesting, that new bandage has double cone: 1/20&1/40 on its surface.
That gives linear contact spot, decreasing resistance, but increasing friction/adhesion...

CONNECTED TRACK VEHICLES

University note