[Lamplighter]

I found something for the Körting system (Germany).
Technical reports from Imperial Royal Austrian State Railways.
Handling and maintenance also from Imperial Royal Austrian State Railways.

The Körting and Hardy systems can be combined. The difference is in the brake cylinders. Both systems used a vacuum of 52 cm Hg at steam pressure in the boiler 7 to 10 bar.
Some detected parameters:

Locomotive Tendr   Carriage 2axl.	
2	   2	   1	         Number of brake cylinders per vehicle
18	   15	   15	         Brake cylinder size (inch)
0,318	   0,239   0,119	 Total area of pistons (m2)
1:11,5	   1:16,8  1:7	         Ratio lever gears
			
			
21	18	15	Brake cylinder size (inch)
2,205	1,642	1,125	The estimated volume of the auxiliary reservoir (cu.ft)
0,0624	0,0465	0,0319	The estimated volume of the auxiliary reservoir (cu.m)
0,5334	0,4572	0,381	Diameter of pistons (m2)
0,2235	0,1642	0,1140	Area of pistons (m)

[darwins]

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Good news:

It's the very same company, and they promply responded to my request. They say they have some old manuals from the 1960's and they can try to find the correct one if I provide them with the correct model number.
So what I have to do now is make a 75mile run to the museum were they have the only remaining 1800 loco preserved, ask to get to the inside of the loco and hope that the vacum exhausters are still in place and carry any visible plate or marking.

this is actually getting fun!

In UK I have found details of Northey exahuasters fitted to English Electric Class 40. These were (2) - Northey 125 R.E. type, capacity 85 c.f.m @ 1,000 r.p.m and 125. c.f.m. in release position.

I believe there were other classes fitted with Northey exhausters, but do not have more detail on those.

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Technical reports from Imperial Royal Austrian State Railways.

There is a lot of information there. I will need some help to understand it all (not at all good at German).

In general it looks as though the various automatic vacuum brake systems operated in a similar way to the one used in Britain.

The brakes have a quick acting valve - for fast application = Direct Action Valve.

The brake valve on the ejector at the bottom has four positions marked. I can make out RELEASE / RUNNING / SERVICE / QUICK APPLICATION

Some of the locomotive plumbing is rather different though. Some locos even have a separate ejector just to release the loco brakes.