Well, I’m afraid I’m not very good at this updating lark nowadays, work, college and exhibitions have taken their toll on me, but no fear I have done some work!
First of all I have finished infilling the tramway up to the town, it took a little while to cut the cork / card because of the curved facia and the curved tram track, it also took a while to fill any gaps between the rail / road with filler (mostly because of the wait to allow the filler to dry before sanding it back).
Then I proceeded with painting on the ‘Tarmac’ colour so I could mark out the paved areas and Road Marking, it was only when I started marking out the markings that I realised I had decided to model the most complicated Road Junction in Croydon, this is what it looks like at the moment:
The Road Running from the Back of the Layout to the front will be ‘Station Road’, with the Road running along the edge of the layout will be ‘Orts Road’, while the road bridge at the middle of the layout will be ‘Norwood Road’.
All the Road Markings are hand painted using Strips of Tamiya Masking Tape, the Double Yellow Markings are ‘Faded Yellow’ from Humbrol and made using the tape cut into thin strips (I haven’t measured them, they have been sized by eye alone!), these have come out really well I feel. The White markings weren’t so easy, the paint (Humbrol again) was thin, so seeped under the masking tape at some points, so I had to go around and tidy it up again. The ‘Dots’ you can see following the line of the Tramway are made using The layout of Road Markings were taken from a combination of Google Earth / Streetview and the Traffic Signs Manual Chapter 5.
You can also see that most of the Pavement has been laid down as well, this is the Scale Scenes Pavement, although it has been modified to ensure that I have curved curb stones on the curved sections of Pavement! I’ve still got a little bit to finish off down by the Tramway entrance as well as the central reservation of ‘Station Road’. Once I’ve done that, I’ve got to add fence / wall done the railway retaining wall and the bridge wall over the railway. Finally I need to add a section of the Station Building and then I can get on with detailing the scene.
I also have to start thinking about OLE for the Tramway, not to mention a Tram…
You can also see that the S&T and E&P Departments have moved in, but if you can’t here’s a close up of the works so far.
I’ve managed to install the necessary Impedance Bonds on this board. They are the black boxes in the four foot with Aluminium Strips leading from them. The Bonds are my own 3D Printed design, while the ‘Aluminium’ Strips are lengths of plasticard painted with Revell Aqua Colour ‘Aluminium’, funnily enough!
Impedance Bonds are used in DC Traction Areas. In Electrified areas, the Return Traction Current is sent back through one of the running rails, now obviously, this requires a continuous path to get back to the substation, but to provide adequate Train Detection, the rails have to be split into sections, now on the face of it, we can’t do both of these things together, but that’s where the impedance bond comes in. In DC Traction Areas, both Rails are split at the limits of each track circuit, but to carry the DC Return Current around the joint, a cable is connected to one rail either side of the joint, this ensures that the DC Current will pass over the joint, but it will also allow the AC Track Circuit Supply to Pass around the joint, effectively joining two sections together (AC Supplies are used for Track Circuits as the Relays operate by AC supply won’t be operated by the DC Current). To prevent the Track Circuits ‘mixing’ an impedance bond is inserted into the cable, these are basically a large copper coil immersed in a bath of oil, and provide a high ‘impedance’ to AC Electrical Supplies, while allowing DC Electrical Supplies to pass unhindered, so it stops the AC Supply from passing around the joint, but allows the DC Supply to go around the joint.
Now a word on positioning, where two plain line track circuits (i.e. no points in either track circuit), a bond is position either side of the rail joint with the aluminium plate spanning the two, simples. If a Plain Line Track Circuit needs with a track circuit which has S&C (Switches & Crossings, Points) in it, then a single bond is located on the side of the track circuit without the S&C in it, with the plate leading from it into the other track circuit. I attach a drawing provided by Phil-b259, a fellow RMWebber and Colleague in Maintenance, I hope he doesn’t mind me using it here:
All the Track Circuits on town board have S&C in them, or butt up to a track circuit with S&C, so I only require four bonds. They are placed as they would be in real life, although you have to imagine the IRJ’s! The ‘Joints’ have been imagined at being 10m from the Toes of the Switch, a standard measurement these days, the bonds being placed a couple of sleepers further away. You’ll also notice that ‘NR001’ has appeared on the layout, for the moment this is purely to mark up the installation hole, it isn’t fixed yet. The signal is also positioned as prototypically as possible, being 15 metres from the toes of the points, the signal being positioned 5m from the Track Circuit Joint, this acting as the Replacement Joint for the signal. 15m is really as close as you’ll get in real life between a point and signal, although we try to place them much further away (up to 800 metres).
As mentioned the E&P department have moved in to installed the Point Heating Equipment, although all that can be seen on the layout are the Point Heating Transformers, again 3D Printed to my own design.
That’s it in terms of exciting stuff, I have been working on the Flow Charts and Wiring Diagrams for the Signalling, but it’s not that exciting to show, so I won’t J
I’m also working on a Illuminated (but Stationary) Banner Repeater to replicate ‘T30BR’ at the town end just before the bridge, again 3D Printed, so watch my thread for that!
As always, any questions, please Ask!