[edwardk]

Are there any working models with more than 2 bogies that can be used for testing? As a note, I am hoping the working model follows the standard modeling guidelines without the hacks that I was running into before. I will do what I can.

Edit: I was hoping to start off simple. Say 3 bogies with at least 3 axles. The reason is that there were hacks that I had to test for that would not work under OR so there is a possibility that what we want here will conflict with the hacks.

Edward K.

[darwins]

If you just want to do testing, you do not need a finished model.

I could very quickly knock up a very crude model of something that interests me - a garrat - two bogies each with a sub-bogie... or possibly one with two bogies each with two sub-bogies.

(For a three bogie machine on a rigid frame I could invent one - but like dragons, I am not sure that I have seen one or know of a plan for one.)

Just wondering if the lateral movement idea could be used to improve long wheelbase six wheeled stock (which currently works best following the MSTS fix of pretending they are two bogies) or even with Victorian radial axle coaches...

[copperpen]

I have one from the old Abacus trainsim pages. It is a transfer locomotive that has 4 two axle bogies, with each pair of bogies attached to a bolster with the loco body riding on the bolsters.

I also have the part built Little Joe with 4 bogies sans wheels right now.

[espee]

Most Japanese locos appear to be TriBo's or BoBoBo or BBB depending on your language. So lateral movement of a middle bogie/truck would be very welcome :)

In my humble opinion all you would need is a tri bogie/truck test model with the ability to see the bogie/truck swivel and lateral movement.

Something like below:

[RTP]

Try:

http://www.trensim.c...act=view&id=933

Regards.

[darwins]

Wow.. that is a very nice looking RENFE loco.

Meanwhile I am having trouble trying to export to OR.

The bogie wheels do not seem to want to parent to the sub-bogies...

http://www.atomic-album.com/showPic.php/121473/problem1.jpg

This is exporting from TSM...

[ianmacmillan]

I spent ages trying to make a 3 bogie wagon set and concluded that it was impossible.

the two outer bogies are easy but inserting a spacer causes problems because it shares the same size centre as the two outer bogies.

http://www.atomic-album.com/showPic.php/80489/3bolsters.jpg

espee's screenshot shows the problem.
The centre bogie is off the rails

[RTP]

In my system works.
Note the lack of lateral displacement in the central bogie.

Regards

Attached thumbnail(s)

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[darwins]

@ RTP - how do achieve that in your system?

Just putting the Garrat above into OR - noticed that because the driving wheels are attached to bogie 1 and bogie 2 then the driving wheel radius (rather than carrying wheel radius) needs to be entered in the wag section in order for driving wheels to rotate at the correct speed.

So at present carrying wheel radius is not in the eng file - carrying wheels in the model are parented to bogie 11, bogie 12 (children of bogie 1), bogie 21 and bogie 22 (children of bogie 2).

Just thinking that if someone wants to work on this they will probably want to manually edit these things in the shape file before trying to work out how they should be done in the general case.

The good thing is the boiler and the two bogies with the driving wheels can all be one unit - so even now could be in one eng file.

Since the carrying wheels are not important to the loco physics I am wondering if the could added as separate objects in some other way... just they happen to pivot under the driving wheel bogies.

[edwardk]

RTP, on 16 February 2018 - 09:14 AM, said:

In my system works.
Note the lack of lateral displacement in the central bogie.

Regards

What is lateral displacement? Are we talking about the pivoting of the bogie? There is a possibility that full support of more than 2 bogies could require digging into areas other than just recognizing additional bogies and axles. For example, the once known single axle issue was caused by a spacing issue between the axle and the bogie. If the axle was under the minimum value, the bogie/axle would never pivot. A workaround was put together, but the source of the issue was never fully understood and solved. In fact I just remembered that there is code that is responsible for the overall tracking so hopefully I won't have to dig that deep since this area could very well be outside my current experience.



Edward K.