Welcome to the forum   
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Share
Options
View
Go to last post in this topic Go to first unread post in this topic
Offline JohnjeanB  
#1 Posted : 05 December 2018 13:15:04(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 469
Location: Paris, France
Hi

Here is a little video on the (very little) marshalling yard on my layout.
It is controlled by Rocrail and more specifically by the command recorder and is 100% automatic.




The main sensor (the one that activates the decoupler) is one of the decoupler rails (in fact only the half of it past the decoupler center).
It works not too bad but I need to replace it with on opto sensor.
This is a work in progress
If some of you are interested I can provide a more detailed description

Cheers

Jean
My lay-out videos
General operation
Loco change
thanks 14 users liked this useful post by JohnjeanB
Offline Chris6382chris  
#2 Posted : 05 December 2018 13:42:31(UTC)
Chris6382chris

United States   
Joined: 27/11/2009(UTC)
Posts: 1,091
Location: Middle of the US
That is so cool. Really neat stuff.

Chris
Offline twmarklinfan  
#3 Posted : 05 December 2018 17:10:34(UTC)
twmarklinfan

United Kingdom   
Joined: 08/05/2015(UTC)
Posts: 162
Location: Tunbridge Wells, Kent, United Kingdom
Very impressive,really enjoyed watching the video Thanks
Offline Jabez  
#4 Posted : 05 December 2018 23:45:09(UTC)
Jabez

Belgium   
Joined: 30/08/2016(UTC)
Posts: 527
Location: Brussels
Originally Posted by: JohnjeanB Go to Quoted Post

If some of you are interested I can provide a more detailed description

Jean

Yes, please do. The detached cars shoot off as if propelled by some impulse. Is the motion of the loco and its sudden stop combined with the precise moment of car uncoupling enough to produce this effect?
Jabez

I heard that lonesome whistle blow. Hank Williams
Offline JohnjeanB  
#5 Posted : 06 December 2018 11:37:53(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 469
Location: Paris, France
Hi Jabez

Slope Because of limited space, the humping slope is reduced to a downhill gradient of 1% which from the decoupler and the first switch goes down to 3% and then the slope is reduced to 2% on the receiving tracks.

Automatic Operation
The automatic operation with Rocrail makes use of the command recorder (initiates orders from a text file). It includes:

- a starting phase (the humping signal is set to "manoeuver relatively slow", the receiving blocks are disabled (such as not to have a "ghost train"),
- a cycle for each car of: (a) setting the switch(s), (b) starting the loco, (c) set a pause of 5 seconds before next car cycle is processed.
- an ending phase which includes (a) setting the humping signal to "manoeuver fast", (b) reverse the humping engine back to the previous block, (c) stop the engine, (d) send a short horn signal, (e) set the humping signal to "stop manoeuvering", (f) re-enabeling the receiving tracks' block.

In parallel to this a Rocrail action, activated by the decoupler detection track (a) stops the humping engine, (b) triggers the decoupler both being adjusted in delay so that the train stops when the next coupling hook is above the decoupler and so that the decoupler is activated at the right time. If the decoupler is activated just a little past the coupling hook, it no only raises the hook but also gives the car an small horizontal impulse.

The decoupler (C-Track) is modified so that its tracks are insulated from each other and one of the rails is cut in its middle (using a dremel-like tool) and only the second half of one reail (past the decoupler center is used for detection

Voilà. I hope it is not too confusing
Cheers

Jean

Edited by user 08 December 2018 13:03:52(UTC)  | Reason: Not specified

My lay-out videos
General operation
Loco change
thanks 3 users liked this useful post by JohnjeanB
Offline JohnjeanB  
#6 Posted : 15 January 2019 13:59:10(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 469
Location: Paris, France
Hi

Here are some new developpments on the marshalling yard on my layout

First a video of the new behaviour


The changes:

Coupler detection by an optical (IR) gate
Why: the only way I found to detect the couplers in all sorts of wagon's shape is to have an Infra-Red beam shooting is an oblique way between the coupler and the buffer. The beam cannot be horizontal to work with all types of wagons..
How: a standard S88 input is high impedance, 5 V and a standard photo transistor (looking like a standard diode) can be simply connected to it and drive it. A 1 microfarad capacitor between the S88 input and the layout-ground suppress possible electrical noise caused by the decoupler. A standard IR diode is sending an IR beam. Very simple really
The IR Gate
UserPostedImage

The other thing is the XML- written program to drive the loco, the switches, signals and the decoupler
I can provide more details to those of you if needed.
Please provide opinions or ideas. Thanks
Cheers

Jean
My lay-out videos
General operation
Loco change
thanks 6 users liked this useful post by JohnjeanB
Offline orionstars  
#7 Posted : 23 January 2019 21:46:09(UTC)
orionstars

United States   
Joined: 15/02/2018(UTC)
Posts: 30
Location: Tosa
This is so very cool!

Well done and I'll read the rest of this thread now. Just felt the need to instantly shout "Fantastic!"

Pete
Offline Elsleuth1  
#8 Posted : 23 January 2019 22:21:59(UTC)
Elsleuth1

United States   
Joined: 23/04/2014(UTC)
Posts: 66
Super cool. In the 1960s I worked as a switchman in the Union Pacific yards near downtown Los Angeles. Part of my job was to ride the cars down the track and set the brake softening them so they didn't hit the cars already in line too hard. I was supposed to check the brakes on the cars already in the line. Once I skipped that step and when the moving car came in contact with the line of cars they went hurling down the track and smashed into the side of a standing car. It caused quite a bit of damage. I was lucky they didn't fire me.
thanks 2 users liked this useful post by Elsleuth1
Offline JohnjeanB  
#9 Posted : 24 January 2019 13:38:13(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 469
Location: Paris, France
Hi

Thanks all for your comments.
Elsleuths: yes the key question is landing speed. I understand in the real railroad, they have speed radars computers and slowing down brakes.
In some countries in the past they used "drag shoes" (sabot de freinage in France) sort of wedge installed by teams "on the fly" very dangerous indeed!


Now the question is how to make this in miniature as I have no tools nor talent for creating precise mechanic devices?
Any ideas on the electro-mechanical part??

Cheers

Jean
My lay-out videos
General operation
Loco change
Offline kiwiAlan  
#10 Posted : 24 January 2019 14:31:55(UTC)
kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 4,258
Location: ENGLAND, Didcot
Originally Posted by: JohnjeanB Go to Quoted Post
Hi

Thanks all for your comments.
Elsleuths: yes the key question is landing speed. I understand in the real railroad, they have speed radars computers and slowing down brakes.
In some countries in the past they used "drag shoes" (sabot de freinage in France) sort of wedge installed by teams "on the fly" very dangerous indeed!


Now the question is how to make this in miniature as I have no tools nor talent for creating precise mechanic devices?
Any ideas on the electro-mechanical part??

Cheers

Jean


I have had some thoughts about something similar in the past. One thought had been to use some lengths of foam plastic fixed to rub on the back of the wheels, but this would be a permanent thing. Another option would be to use an R/C servo (like people use for point motors) to do the clamping action shown in that video.

The biggest problem is that the model wagons are so light that almost anything will stop them dead.

Offline JohnjeanB  
#11 Posted : 24 January 2019 17:41:44(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 469
Location: Paris, France
Hi

Here is a video of of a real marshalling yard east of France (Woippy in Mosel region). Of course more and more shipment are with complete trains (no sorting out necessary).

Here you may see a double mashalling hump to speed up the train preparation and track brakes in action.
Of course my reproduction is very simplified but I would fill my train room with just 20% of thatBigGrin

Cheers

Jean
My lay-out videos
General operation
Loco change
Users browsing this topic
OceanSpiders 2.0
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

| Powered by YAF.NET | YAF.NET © 2003-2019, Yet Another Forum.NET
This page was generated in 1.475 seconds.