[Coolhand101]

Hi

In MSTS, the friction brake display acitvated when there was an actual brake pressure in the brake cylinders.

In OR, this display only works when the train brake handle is moved from release. If the train brake handle is put in release, this display will extinguish even when there is still a brake pressure showing in the brake cylinders. So this display is just showing the movement of the train brake handle.
Because of the this, the friction brake display does not work, when the engine brake handle shows a brake pressure in the brake cylinders.

This display is useful, to tell if there is any dragging brake, ie Engine brake handle not fully release, Train brake pressure slowly releasing.

Also with the engine brake, pressure can still be applied to the maximum Brake force, even when there is no Main Reservoir pressure. In MSTS, the brake cylinder pressure from the engine brake was proportional to the main reservoir pressure, ie, if the main reservoir showed a low pressure of 40 psi, then the engine brake pressure will also show this figure, when the engine brake was fully applied. If the engine brake max brake cylinder pressure was 75psi, then the main reservoir pressure had to be at/past this figure for this pressure to be obtained.

Can these be amemded to work correctly?

Thanks

[gpz]

 Coolhand101, on 19 August 2015 - 01:19 PM, said:

Also with the engine brake, pressure can still be applied to the maximum Brake force, even when there is no Main Reservoir pressure. In MSTS, the brake cylinder pressure from the engine brake was proportional to the main reservoir pressure, ie, if the main reservoir showed a low pressure of 40 psi, then the engine brake pressure will also show this figure, when the engine brake was fully applied. If the engine brake max brake cylinder pressure was 75psi, then the main reservoir pressure had to be at/past this figure for this pressure to be obtained.

The question here is, what is the working logic of real locomotives, not how it worked in MSTS. I don't know the answer, I can just say, that all air brakes in OR are programmed to set BC pressure from Aux. Cylinder. So if MR is empty, but AC is full, then brake can be applied.

[Coolhand101]

 gpz, on 21 August 2015 - 09:08 AM, said:

The question here is, what is the working logic of real locomotives, not how it worked in MSTS. I don't know the answer, I can just say, that all air brakes in OR are programmed to set BC pressure from Aux. Cylinder. So if MR is empty, but AC is full, then brake can be applied.

The straight air brake ( engine brake ) took the pressure directly from the MR. This was protoypical for UK BR Locos.
Your explanation also explains why the MR pressure does not drop when using the Engine brake. This was also prototypical.

The straight air brake, in theory, could apply the same pressure as of the MR. A limiting valve was used for the engine brake, to limit the max brake cylinder pressure. This was between 60 and 75psi for UK locos.

Thanks