Problems With Trainsimulations BNSF Scenic Subdivision Demo Route

[meeshu]

Thank you!

[eric]

Remember when some of us said derailment were..... never mind.

Sent from my SM-S911U using Tapatalk

[derekmorton]

I now believe there is no bug, just a bad calculation of numwheels in the case of 3 and 5 pack units.

This takes me back to the problems with 3 pack and 5 pack units that I have previously written about, I have made up this table:-

axles

3 cars
2-2 2-2 2-2 = 12 axles numwheels 4

3 pack
2 2 2 2 = 8 axles A = nw3 C = nw2 B = nw3 3+2+3 = 8 axles outer cars numwheels 3 inner cars numwheels 2


5 cars
2-2 2-2 2-2 2-2 2-2 = 20 axles

5 pack
2 2 2 2 2 2 = 12 axles A=nw3 C=nw2 D=nw2 E=nw2 B=nw3 3+2+2+2+3 = 12 axles outer cars numwheels 3 inner cars numwheels 2

I will now test those figures on the activity

First test with NO derailment warnings.

If anyone does not know what to modify, let me know.

edit: spacing gets messed up here

[niknak]

Great work Derek! Yes I (and maybe others) would appreciate a guide showing what to change and to what.

[derekmorton]

Meeshu,

I expect you to test these settings and report back.

The zip files contain the modified files.

[meeshu]

Since I'm expected to check the latest changes to some of the car (wagon) files, then I'd better do so as ordered.

Ran the activity What Goes Up using the default consist for this activity but with the above (dl.zip) changed car (wagon) applied first.

Car derailments still occur but to a lesser extent.

Derailments occur in the vicinity of MP 1728, near the invisible switch, and after MP 1726 near the (formally mysterious) signal.

Cars derailed and listed in numeric order -

0-11 derailed 3 times
0-31 derailed 2 times
0-32 derailed 2 times
0-41 derailed 3 times

[derekmorton]

The zip file contained 8 eng files, no consist parameters.

[meeshu]

The zip file contained 8 eng files, no consist parameters.

Actually the zip file I downloaded contains 10 modified car (wagon *.wag) files. No engine *.eng files included within the zip file I downloaded.

[derekmorton]

I have not explained the problem well at all.
Firstly the problem is with the parameter "numwheels"

With a normal wagon, there are 2 bogies/trucks, so that means that there are 4 axles per car. That is why the normal value of numwheels is 4.

In a 3 pack wagon set, there is only 2 axles between each wagon, not the 4 axles as with 3 normal wagons, so the physics for these wagons is different. This is what is causing the derailment messages.

The analysis of the 5 pack set is similar.

What you need to do?

The simple way for the scenic derail messages is to replace the original wag files with the 10 in the zip file.
The wag files go in the folder "sli_bnsf_freight or sli.bnsf.freight, which ever you have.

The long explanation:-

A 3 pack has an A, B and C wagons, in a consist, the wagons go A-C-B.
A 5 pack has an A,B,C,D and E wagons, in a consist they go A-C-D-E-B.

3 pack
A and B have numwheels 3, C has numwheels 2

5 pack
A and B have numwheels 3, C-D-E have numwheels 2

I hope that gives some clarity. :-)

[derekmorton]

Meeshu,

What did you do with the10 wag files?

[kapitaen]

@ derekmorton

Just for your information: the entries in all 61 wag.files is set to NumWheels ( 8 ).
The route is installed this month with the OpenRails Auto Installer and the wag.files are dated 19.04.2024.

Screen Shot 12-12-24 at 08.34 PM.jpg
Jan

[derekmorton]

Kapitan,

The discussion here is mainly about 5 pack wagon sets.

[geepster775]

I modified my Mullan consist using Derek's numwheels findings. The 'drawbar empty' (numwheels 2) did make it around the first troublesome curve, but the empty further back in the B position (numwheels 3) did not.

They all were derailing just below the Foss River bridge, including the load right behind the power, but that is an improvement as the entire first 3-unit car derailed here prior to the mods.

https://www.youtube.com/watch?v=3Gu_vU8gUBo

[derekmorton]

Kevin,

What activity and consist?

[geepster775]

What Goes Up. I just used the (later) Mullan equipment to see how it varies from the (older) Scenic default stuff. I took the Mullan consist "BNSF Dash 9-44CW 63car Q-SSEALT frd", cloned it, replaced the Boeing skybox car with a 4th Mullan GE, and deleted a few general freight near the rear to get the consist down to equivalent weight, car count and length as the original 'what goes up' consist. The only mods to wag files involved the 53 foot stacks and were changed to what you suggested. I simply notepad-edited the player service to change out the consist name.

Mullan.zip