diff --git a/Source/Documentation/Manual/physics.rst b/Source/Documentation/Manual/physics.rst index 48663f7253..5b4f23b0b1 100644 --- a/Source/Documentation/Manual/physics.rst +++ b/Source/Documentation/Manual/physics.rst @@ -1368,7 +1368,7 @@ A level below 70% uncovers the firebox crown. In real life, this is a catastroph which melts the fusible plugs in the crown and that releases steam into the firebox and from there onto the footplate. -Open Rails does not model the steam but drops the boiler pressure and the fire +Open Rails does not model the steam release but drops the boiler pressure and the fire and issues a confirmation message: "Water level dropped too far. Plug has fused and loco has failed." Basically the loco is coasting thereafter and nothing can be done to recover. @@ -1504,6 +1504,9 @@ drop whilst the fire is building up. Similarly if the steam usage is dropped (due to a throttle decrease, such as approaching a station) then the fire takes time to reduce in heat, thus the boiler pressure can become excessive. +When the AI Fireman is operating in this simplistic manner, excess pressure +is bled off silently and the safety valve operation is suppressed. + To give the player a little bit more control over this, and to facilitate the maintaining of the boiler pressure the following key controls have been added to the AI Fireman function: @@ -1521,10 +1524,14 @@ boiler pressure from exceeding the maximum. This function will be turned off if AIFireOn, AIFireReset are triggered or if boiler pressure or BoilerHeat drops too low. +Once AIFireOn or AIFireOff have been used, the safety valves work normally +as for manual firing until they are reset back to the same operation by the +pressure dropping to a low enough level. + AIFireReset - (````) - turns off both of the above functions when desired. -If theses controls are not used, then the AI fireman operates in the same +If these controls are not used, then the AI fireman operates in the same fashion as previously. Steam Boiler Heat Radiation Loss