Comment 2 for bug 1393270

Regardless of the formula and regardless of whether MSTS is right, wrong or broken, when you close the throttle on a steam locomotive the exhausting stops. Period. Such should be the action in ORTS, and it is not.

Herb Kelsey
In God We Trust

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Peter Gulyas
Sent: Thursday, November 20, 2014 12:08 PM
To: <email address hidden>
Subject: [Bug 1393270] Re: Steam Engine exhaust with closed throttle

Locomotive chuffing volume is controlled by the following formula, it is proportional to the effort the engine puts up at a time:

Variable2 = Math.Min(CylinderPressurePSI / MaxBoilerPressurePSI * 100f, 100f);

This variable is closely related to the actual steam locomotive physics calculations. In MSTS the steam physics is completely different, and probably partly broken. Thus replicating the behavior here is nearly impossible. This was discussed on ET, and based on the discussion I would mark this bug report as "Won't fix" status.

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https://bugs.launchpad.net/bugs/1393270

Title:
  Steam Engine exhaust with closed throttle

Status in Open Rails Tracker:
  New

Bug description:
  When you close the throttle on a steam locomotive in ORTS the exhaust
  continues as though it were open and pulling. I have discussed this
  issue on the ET forum but it is time to memorialize it with a bug
  report.

  Steam locomotives DO NOT chuff with the throttle closed and coasting.
  MSTS properly stops chuffing when the throttle is closed but OR does
  not. Some folks have found a workaround by altering a locomotives
  .sms file, but this is a compatibility issue with MSTS and the users
  shouldn't have to restructure every .sms file in their Trainset folder
  to work around an OR glitch.

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