Hi,

I am using Marklin C tracks with MS2. I need some help with train automation. Based on the figure below, is there a way to change the signal (either 7039 or 76493) at point A from red to green when a train passes point B? If you can provide the wiring schematic, it will be greatly appreciated.

I have M83, which I think can be used to control signal 7039. I don't own any contact or circuit tracks. Thanks in advance for your help.

Edited by user 15 July 2017 06:23:26(UTC)  | Reason: Not specified

If you don't have a contact/switch track, or some other occupancy detector, it will be a true challenge to accomplish it.

With a contact track, you can change the turnout an "analog" signal as the 7039 with track voltage.

With a CS/Ecos or such, you can take it a step further and use s88-type of feedback modules and then use any kind of detector available, but unfortunately I don't think this is possible with a MS/2.

Others may have a better solution, but my answer is from my own experience with it.

The yellow wire provides the power to the signal for its lights and solenoid. Since you are using the power pack and the MS2, the place to get the power is directly from the track, so connect the yellow lead to the B (Bahn) tongue under any section of C track that is permanently powered, i.e. don't don't connect it to any track sections inside the isolated block section shown on your diagram. You should also connect the brown terminal or lead of the signal to the O (earth or negative) tongue beside the B tongue. This earth or ground connection is not shown on your diagram because it probably refers to M track where the signal is grounded by clipping its metal base plate to the metal track bed.
This use of track power to power solenoid accessories is OK for small layouts with few accessories. Those with larger layouts and many solenoid accessories often prefer to draw their accessory power from a separate Marklin or other brand 16V AC transformer. If you have one available then just plug the yellow lead from the signal into the yellow socket of the Trafo and and brown lead into the brown socket.
Whatever method you use, the red leads from the signal go to track current tongues as shown in the diagram. This turns the power on or off in the isolated block so your train will stop when the signal shows red and go when green shows.

DSupra - you do realize that the tracks labelled circuit tracks with the green plug at the top of the loop and the red plug at the bottom of the loop are contract/circuit tracks which you said you don't have. Those tracks complete the circuit - blue wire to ground, for the solenoid coil to be activated which changes the semaphore and internal contacts of the signal.

I looked up the Viessmann 4530 and it seems to be the appropriate substitute for the obsolete Marklin 7039.

Harold.

A footnote on the Viesmann 4530 The Viesmann 4500 does the same job and is a bit less expensive. It is listed as 'discontinued' in the Viesmann catalog but is still available from many dealers. If you find one you can probably save a few bucks.
The circuit track you want is 24994 and you will need two of them. They are straight half-length. If you are building a simple loop as shown in your second plan this is what you need.

Perhaps, a full track plan might explain a little better. I plan on running 3 trains if not more at the same time. Since this section of the track is hidden, I am hoping by automating point A, I can avoid train collisions. The turnout in front of the point A/B will not change. Trains will always go into the tunnel on the right track and exit the left track.

From my understanding, if I put a circuit track between point A and the turnout, as the train passes over the circuit track, it will change the signal back to red at point A. I could be wrong. So the train that passes point B will eventually stop at point A and will not move until the next train passes point B. By the way, this track plan was based on a track plan on Marklin 5/2012 magazine, which I modified slightly to fit on a 4x8 table.

Edited by user 15 July 2017 06:24:23(UTC)  | Reason: Not specified

Thanks Jabez. The circuit tracks and the signals came in today. After playing with the connections on the two circuit tracks, I finally got it to work. Thanks everyone for your help.