When the lead engine increases throttle or brake, in the trailing units did/do the throttles/brake handles physically move as well, or are they stationary and all "action" is electric/electronic only?
It's all done in the electronics. The handles don't move.
Jeff
The reverser is removed (for safety) and everything is positioned in idle/neutral. If you try to go into the locomotive and move the levers around nothing will happen since the unit it set up to be controlled by the leading unit. Looking at documentation, I believe applying locomotive and independent brakes still work.
Max Karl, MRL and BNSF
Max Karl Looking at documentation, I believe applying locomotive and independent brakes still work.
No they do not because they are cut out and pinned so they don't move.
.
BigJimNo they do not because they are cut out and pinned so they don't move.
I was waiting for better authorities to mention this, but it hasn't appeared 'as such' yet: MU control of trailing units is not done by 'servo control' of the physical handles in the cab, the way some early stereo volume controls actually controlled a little motor driving the physical knob or potentiometer. In some early MU there is a separate brake valve that is commanded via the connections to apply independent or automatic cylinder pressure; in electronic systems using the equivalent of one valve, the control does not 'cause' proportional movement of the handles to show what the valve is commanded to do.
BigJim Max Karl Looking at documentation, I believe applying locomotive and independent brakes still work. No they do not because they are cut out and pinned so they don't move.
i've not see the independent pinned, but the side stand air brakes do have, and are supposed to be pinned if equipped. because if the automatic isn't secured, the handle can be placed into emergency, the only position that is active with the automatic air brake when cut out. The engineer's chair on a trailing engine has more than once swiveled around knocking the brake handle from Handle Off to Emergency.
jeffhergerti've not see the independent pinned, but the side stand air brakes do have, and are supposed to be pinned if equipped. because if the automatic isn't secured, the handle can be placed into emergency, the only position that is active with the automatic air brake when cut out. The engineer's chair on a trailing engine has more than once swiveled around knocking the brake handle from Handle Off to Emergency.
Some of our engines have rebuilt brake stands that are missing their "pin holes". Someone, somewhere, doesn't understand why there were holes in those things.
It's been fun. But it isn't much fun anymore. Signing off for now.
The opinions expressed here represent my own and not those of my employer, any other railroad, company, or person.t fun any
zugmann jeffhergert i've not see the independent pinned, but the side stand air brakes do have, and are supposed to be pinned if equipped. because if the automatic isn't secured, the handle can be placed into emergency, the only position that is active with the automatic air brake when cut out. The engineer's chair on a trailing engine has more than once swiveled around knocking the brake handle from Handle Off to Emergency. Some of our engines have rebuilt brake stands that are missing their "pin holes". Someone, somewhere, doesn't understand why there were holes in those things.
jeffhergert i've not see the independent pinned, but the side stand air brakes do have, and are supposed to be pinned if equipped. because if the automatic isn't secured, the handle can be placed into emergency, the only position that is active with the automatic air brake when cut out. The engineer's chair on a trailing engine has more than once swiveled around knocking the brake handle from Handle Off to Emergency.
Swiveling Engineer chairs placing trains in emergency is not limited to DPU trains.
Never too old to have a happy childhood!
Our electronic brake valves (both Wabtec and Knorr/NYAB) have the ability to pin the automatic handle in release, but I've never encountered a scenario that would require this.
I know that you would do this on units with Locotrol I and II when you were setting them up for DP lead operation, but those had a mechanical 26 or 30 brake stand and separate electronic brake valves (with push buttons) for DP operation.
Greetings from Alberta
-an Articulate Malcontent
And we have some with the pin holes, but the pins have been removed. Good thing the chairs can lock in place. Well most of the time.
jeffhergert i've not see the independent pinned, but the side stand air brakes do have, and are supposed to be pinned if equipped. because if the automatic isn't secured, the handle can be placed into emergency, the only position that is active with the automatic air brake when cut out. The engineer's chair on a trailing engine has more than once swiveled around knocking the brake handle from Handle Off to Emergency. Jeff
Jeff,
All of our units had a pin for both the independent and automatic brake handles. Before then, both handles were removable...the independent in release and the automatic in "handle off" position.
Our community is FREE to join. To participate you must either login or register for an account.