Above is the plan for my layout. The area covered in the loft is 24.5' long and 12.5' wide (includes both rooms).
The longest route is out of platform 4, into incline in other room, out of room and up incline to turn right over the viaduct. The train then goes down the right hand incline, and into the other room to swing round and re-enter main room. It then travels along to re-enter platform 4. Total length is 102'.
The sequenced points shown in the passenger bay and goods yard are controlled by using a 'DIODE MATRIX'. I got the idea from the website of davidrobb.me.uk
It does need the ability to read circuits, and to design your own, as each layout is different in its requirements on the number of points.
Point numbers 3 and 4 are marked in the wrong order.
In the above picture is the setup on my train depot. I basically have two circuits - points 1-6 operates trains into and out of platform 2. Points 6-10 operate trains into and out of platform 3.
To get a train into Bay 1, it can be seen that points 1, 2, and 3 and 4 would have to operate - preferably together.
To get a train into Bay 10, points 7, 8, 9, and 10 would have to operate.
Each Bay is chosen by one switch, and this switch sets all the points required for that bay. This is achieved by diodes being fed from a CDU.
Note/ the LED's that can be seen beside points on the picture of the train bay are 12v LED's connected across the points to indicate when a point is against the direction set.
It gives me an instant visual indication which way the individual points points are set. So if I see a train coming out of platform 4 and the light on that side of the point is red, I can quickly change the point before the train hits it. (not prototypical I know, but then my layout is also not prototypical).
I could wire these lights back to the master control board, but it is a bit small, so I have left them on the board.
You may have noticed that if point 1 or 7 is set to the main line, there is no power to any of the bays. This is done on purpose, as removing all power switches off engines and coaches with lights, and also prevents accidental selection of a loco which then causes a hazard by moving. ( and believe me I had a number of accidents before I redesigned).
This is also the reason I do not use point clips.
The switches 1-10 operate each bay - the switches P2 and P3 reset points 1 and 7 back to main, and therefore have a green led to show all is safe.
The LED's in the control box are 5mm 12v (no resistor required) and get their power direct from the DCC voltage on the rails. They are not polarity sensitive.
Each one is wired at the end of the rails of each bay, so when a bay is selected, you know you have power all the way. Their current draw is very tiny ( a few milliamps) so thin alarm wire is fine. (I. use six core wire). and they do not affect the output of the controller.
To move a train, I select the engine number on the controller and its direction out of the bay with speed set to zero. I then press the switch for the bay that it is in, and then move the train into the station. If it was number 2 bay, then I would press P1 to reset to main line.
My 'DIODE MATRIX' board
Below is the circuit diagrams drawn to build my 'Diode Matrix'
In the above drawing, the control box switches are at the bottom, and the relays to operate are on the right (1-6)
The relays coils are shown as 'N' and 'R'. I used 'N' to represent 'straight on' and 'R' to represent the 'turn off' off the points.
If you refer to the picture of the bay layout, you will see that to set bay one, the following coils need to be energised.
Point 1 ='R', point 2 = 'N', point 3 = 'R' and point 4 = 'N'.
This is shown on the above diagram where from switch 1, a diode is connected to each of the coils on relays 1-4.
You should be able to follow the idea from the others. The number of diodes required depends on the number of points you wish to switch each time.
You then need to produce a wiring diagram from the drawings above. The one below is a bit messy, but I am sure you can follow it.
The numbers in the middle represent the numbers marked on the diode drawings. One side you have the switch connections, and on the other side the point connection.
Remember at this point, that the common black wire on the points are all connected together, and a connection taken back to the negative side of the CDU. The positive side of the CDU is connected to the other side of all switches. So your positive power is connected to the coils via the diodes.
The cost of the diodes are 12p. the switches are 40p, (push to make) the 12v led's are 12p, and connectors 7p each. (bought in blocks of 12)
Total cost to operate 10 points is £1.77 per point.
This is a very cheap and simple way to have multiple control of points with the push of one button.
The points I have used are the old Hornby surface points. They are very quite in operation compared to the large existing points with the lineside huts. These points go over with a whacking thump. The old ones just click into place.
I have another diode board operating the seven points on my goods yard.