Steam locomotive vacuum brake ejector

Registered by Dennis A T on 2015-06-12

There were generally 2 Ejectors on a vacuum braked steam locomotive. There was a "Large" Ejector which was used to rapidly exhaust the brake system when the brake controller was set to Release. Alternatively, the Large Ejector control could be operated directly if there was no Release sector on the brake controller. There was also a "Small" Ejector which could be left running to compensate for leakage while the train was in motion and thus avoid dragging brakes.

See bug 1391449 and the discussion, and also see Releasing the Vacuum Brake at http://www.elvastower.com/forums/index.php?/topic/28359-releasing-the-vacuum-brake/page__view__findpost__p__199678

Discussion: http://www.elvastower.com/forums/index.php?/topic/26894-steam-locomotive-vacuum-brake-ejectors/
Blueprint: https://trello.com/c/3b2u9Yzh/141-steam-locomotive-vacuum-brake-ejector

Blueprint information

Status:
Started
Approver:
James Ross
Priority:
High
Drafter:
Dennis A T
Direction:
Approved
Assignee:
Peter Newell
Definition:
Approved
Series goal:
None
Implementation:
Good progress
Milestone target:
None
Started by
James Ross on 2016-12-14

Related branches

Sprints

Whiteboard

#3673 - Initial setup work for steam ejector - added control keys (J and Shft-J)
#3676 - add functionality for steam ejector steam consumption
#3686 - code changes to support further changes to vacuum brakes
#3699 - corrected problem introduced in #3686 (uncoupling cars causes crash)
#3999 - corrected problem in extended HUD whereby vacuum_piped cars were showing pressure in psi
#4000 - added missing application rate parameter to vacuum brakes
#4001 - made more vacuum brake parameters visible
#4003 - adjusted vacuum brakes to allow for pressure gradient
#4007 - added train pipe leakage, and initial small ejector operation to vacuum brakes
#4009 - corrected error introduced in #4007
#4010 - adjusted default values for vacuum braking
#4011 - adjust brake defaults
#4016 - removal of redundant code
#4017 - adjust application of Running Controller
#4032 - rework of vacuum based code to reflect more prototypical operation

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Work Items

Dependency tree

* Blueprints in grey have been implemented.

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