[Jonatan]

I've tried to simulate the cross compound (one HP, one LP cylinder) on a loco I built a number of years ago, but it results in it refusing to move, regardless wether compound (P) is activated or not.

I added the HP and LP parameters

	NumCylinders ( 1 )
	CylinderStroke ( 27in )
	CylinderDiameter ( 21in )
	CylinderVolume ("5.4*(ft^3)")
	LPNumCylinders ( 1 )
	LPCylinderStroke ( 27in )
	LPCylinderDiameter ( 33in )
	LPCylinderVolume ("13.6*(ft^3)")

Am I missing something or can OR not simulate this correctly?

[steamer_ctn]

Jonatan, on 20 November 2023 - 11:36 AM, said:

I've tried to simulate the cross compound (one HP, one LP cylinder) on a loco I built a number of years ago, but it results in it refusing to move, regardless wether compound (P) is activated or not.

Can you try the Compound locomotive on the CTN page? Does it work?

[Jonatan]

I haven't yet because I can't find it, but I don't see what other parameters for compound working I'm missing. I used the guide on your website. I've set up a loco with two HP and two LP cylinders the same way and that works just fine.

If I have one HP cylinder and two LP cylinders, it does not work, but as long as there are two HP cylinders the loco will move. Does OR not count a single HP cylinder in conjunction with one or two LP cylinders as a working loco?

Cross compound means there's one HP cylinder on one side and one LP cylinder on the other. Effectively, it is a single cylinder machine unless using the simpling valve.
https://cdn.discordapp.com/attachments/456765624878628870/1176559598631649330/bild.png

[steamer_ctn]

Jonatan, on 21 November 2023 - 08:28 AM, said:

I haven't yet because I can't find it, but I don't see what other parameters for compound working I'm missing. I used the guide on your website. I've set up a loco with two HP and two LP cylinders the same way and that works just fine.

The compound locomotive can be found here.

Jonatan, on 21 November 2023 - 08:28 AM, said:

If I have one HP cylinder and two LP cylinders, it does not work, but as long as there are two HP cylinders the loco will move. Does OR not count a single HP cylinder in conjunction with one or two LP cylinders as a working loco?

Cross compound means there's one HP cylinder on one side and one LP cylinder on the other. Effectively, it is a single cylinder machine unless using the simpling valve.

As suggested there were a number of different compounding arrangements trialed at various time. When building the functionality, the most "popular" variant was used as a model.

This variant was 2 x HP, and 2 x LP cylinders. Configuring other variants was on the basis that the existing code may not work for them.

[Jonatan]

I see. So my suspicions were correct that OR can't simulate this type.

Then there's no use is trying to make it work, I'll just config the eng to be a simple.

[gwrfan2]

There is a 1LP+1HP-Compound 'Parní lokomotiva ČSD řady 320.0' from this site 'https://vzd-or.eu/ke-stazeni/parni-lokomotivy-a-vozy/3/'. It works in ORTS 1.5.1 but not with newer versions. Did you try your engine with 1.5.1 ?