"TT-Tracks©" Standards

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"TT-Tracks©" Modular System Standards

Version 1.0.3 - May 23, 2011

The following are PRELIMINARY and subject to change. We will modify them as we find out what does and does not work.

Click on Image for larger Size.
 Standard TT-Track Side Module


Basic Modules

Specifications Common to all Modules
. Height
. . The base board height is 2 3/4". It is suggested that you have legs with levelers on them to handle variations in table top surface.
Fascia
A fascia should be mounted on the front to hide the underside of the module. This could be permanently attached or (better) added on after the module is leveled.
. . .

Note - I have found that styrene makes a good light fascia; .060" works well.

Backdrop - Optional
An optional back drop that extends one foot above the base surface may be added to the rear of the module. Whether this is used or not will depend on the setup.
Colors
The base color shall be a dirt brown color
The brown can be any dirt like colour. It is not important. The purpose of the brown is have colour under any scenery material in case the scenery material gets scrapped off. The brown will show instead of the foam or wood colour
The fascia color shall be Rust-Oleum Satin 'Hunt Club Green'.
This color is readily available in North American. European modelers will establish their own color standard based on what is available there. When a color and brand of paint is chosen please let me know and I will add it to these standards.
Power
A small oval display will receive its power from connections on one corner rmodule.
Side modules will receive their power through the rail joiners from a corner module.
On larger displays a power cable will feed power to the corners./td>
The two tracks shall be electrically isolated from each other. Spurs will have power fed from the line they spur off of.
Power Wiring Diagram

Straight Modules
Standard Straight Module
. Length
. . A standard straight module is 497mm long
. . . Derivation of length: The Standard Straight track piece (BG 1 - 166mm) is used to determine the length of a standard straight module. It will be 3 track lengths long less 1mm. That is 497mm long. This is a maximum length for a standard three track segment module. Any longer and the track connectors will not mate properly. The 1mm deduction is to allow the connectors to hang out far enough to connect to the next module. If the module is longer than that the connectors will not stick out far enough to connect properly with the next module. Too short and there will be an unsightly gap between modules.
A length of three pieces was chosen as this is long enough to have a single crossover and another turnout as a spur.
Permissible Variations in Length
Longer modules are permitted as as long as they are a multiple of the basic 166mm track length.
For 'Donut' setups if someone makes a module of non-standard length it is up to them to make sure the necessary filler module is available to make the oval work.
A setup coordinator may want to have filler modules of one track length and two track lengths on hand to allow for odd sized modules.
Depth
The side of a standard module will be one foot in depth
30cm is an accepted variation on 12"
30cm may be easier to make for our European members. As well some nominally 12" wide foam sheets are actually only 30cm wide.
Track Location
The center line of the front track shall be 95mm from the front edge of the module. That is 80mm to the front edge of the bedding track. The centerline of the second track shall be 138mm in from the front of the module (43mm back from the second track).
The two mainline tracks shall be at right angles to the ends. Any other tracks you have may be at any angle to the ends but be aware of problems joining such tracks over module joints.
Getting the center of the track over the centerline has been a bit of an issue. After determining the bedding track base was 30mm wide it was found easier to measure to the front of the track. As for unknown reasons the track has shifted to the rear about 1/4 inch, the standard has been changed to this new track location.

Corner Modules
Corner Module - Sharp Curves - Deprecated.
 Standard Sharp Curve Corner
module
Size
A standard corner module will be 17 1/4" square
Track
A standard Corner will have two quarter loops of track on it, one BR1 (310mm) and one BR2( 353mm). The ends of the track sections will extend approximately 1/2mm from the edge of the modules.
The first setup has shown that curves on the small corner modules are too tight for North American Equipment. Short European equipment runs OK.
Power
Every second corner module should have power connections on it using #83951 - Rail Joiners with Solder tabs or Kato 24-818 Terminal UniJoiner, 35" Leads [1 pair].
The tracks shall be electrically isolated from each other.
When displays get large enough power will be fed to each corner with a cable using Anderson Power Pole Connectors.
The orinetation of the Andeerson power pole shall be as illustrated.  Anderson Power Pole Connector Orientation
Corner Module - Medium Curves
 Standard Medium Curve
Corner module
Size
A Medium Curve Module will be 19" square
Track
A Medium Corner Module will have two quarter loops of track on it, one BR2 (353mm) and one BR3( 396mm).

The BR3 line will be made from Tillig #83111 - R 31 - Curved track: R 15 5/8" / 30 on a roadbed or from flex track on a roadbed..

Because the R31 track pieces do not have the appropriate track connectors to join modules together, there will be a BG4 straight track piece at the end of each curve.

The ends of the track sections will extend approximately 1/2mm from the edge of the modules.
Corner Module - Broad Curves - Now the Standard Corner Size.
 Standard Broad Curve Corner
module
Size
A Broad Curve Module will be 24" square
Because a 24" square module tales up a lot of space it is recommended that the front and rear corners be trimmed to make a diamond shape.
Track
A Broad Corner Module will have two quarter loops of track on it, one a nominal radius of BRF4v (482mm 19") and the other BR5 (439mm 17 1/4").

Both curves will be made from flex track on a road bed.

Because the flex track does not have the appropriate track connectors to join modules together, there will be a BG4 straight track piece at the end of each curve.

The ends of the track sections will extend approximately 1/2mm from the edge of the modules.
Corner Module - 30" Square - Under Construction
 30 inch square Corner
module The edge clearance is a bit tight. A clear finger shield is necessry.
Corner Module - 36" Square
 36 inch square corner
module
The front edge clearane is too tight. A 20mm extension is needed, perhaps sceniced as a rock wall, with a clear finger shield.
A different method of construction could remove the need for this.
Corner Module - One Metre Square - Being contemplated for 2018.
 One meter square Corner
module
The front edge clearane is too tight. A 20mm extension is needed, perhaps sceniced as a rock wall, with a clear finger shield.
A different method of construction could remove the need for this.
Standard Curve dimensions:
  • R1 -- 310 mm -- 12.2 in BR1x Bedding Track Pieces
  • R2 -- 353 mm -- 13.9 in BR2x Bedding Track Pieces
  • R3 -- 396 mm -- 15.6 in Available as sectional track
  • R4 -- 439 mm -- 17.3 in Flex track or handlaind track.
  • R5 -- 482 mm -- 19 in s
  • R6 -- 525 mm -- 20.7 in
  • R7 -- 568 mm -- 22.4 in
  • R8 -- 611 mm -- 24.1 in
  • R9 -- 654 mm -- 25.7 in
  • R10 -- 697 mm -- 27.4 in
  • R11 -- 740 mm -- 29.1 in
  • R12 -- 783 mm -- 30.8 in
  • R13 -- 826 mm -- 32.5 in
  • R14 -- 869 mm -- 34.2 in
  • R15 -- 912 mm -- 35.9 in
  • R16 -- 955 mm -- 37.6 in
  • R17 -- 998 mm -- 39.3 in
  • R18 -- 1041 mm -- 41 in
  • R19 -- 1084 mm -- 42.7 in
  • R20 -- 1091 mm -- 43 in

Flex Track on Modules

You can use flex track on your modules as long as they have a section of bedding track at the edges to connect to the next module.
You can use a short piece (BG3, BG4 or BG5) or make your own by cutting up longer pieces.
I have had good success using a BG2 cut in half, then after the pieces are glued into place on the edge of the module, removing the rails and running the flex track rails to the edge.


DC Electrical

One power pack will be required for each line of track. Connect to the power connections on one corner. If the display is big enough you may have to arrange for a second power feed on the diagonally opposite corner.


DCC Electrical

One DCC system will be needed to operate the display. It should feed a power manager with two sections. One section will be used for each line of track.

DCC Controlled Turnouts

To prevent confusion on layouts with DCC controlled turnouts, turnout address space will be allocated in groups of 20 addresses. This allows for some DCC Turnout controllers working in groups of four.
When a builder needs a block of addresses they will request one and it will be logged here. Where the builder has a DCC system that does not allow access to the full address range, things will be adjusted so they get an address block that they can use with their system.

Current allocations are:

  1. 0 - Addresses 0 though 9 are unallocated to allow for modules at a display that have not been addressed properly.
  2. 1 - Bill Dixon = Addresses 10 through 29
  3. 3 - Bjoern = Addresses 30 through 49
  4. 5 - Tibi = Addresses 50 though 69
  5. 7 - __________ Addresses 70 through 89
  6. 9 - __________ Addresses 90 through 109
  7. 11 - __________ Addresses 110 through 129
  8. 13 - __________ Addresses 130 through 149
  9. 15 - __________ Addresses 150 through 159
  10. 19 - __________ Addresses 190 through 209
  11. 21 - __________ Addresses 210 through 229
  12. 23 - __________ Addresses 230 through 249
  13. 25 - __________ Addresses 250 through 269
  14. 27 - __________ Addresses 270 through 289
  15. 29 - __________ Addresses 290 through 309
  16. 31 - __________ Addresses 310 through 329
  17. 33 - __________ Addresses 330 through 349
  18. 35 - __________ Addresses 350 through 369


    Setup Guidelines

    The SETUP COORDINATOR with determine the mode of operation for the diplay (DC or DCC). They shall also determine if backdrops are to be used.

    Setup Guidelines for Donuts

    For small corners ask for 40" wide tables. 40" gives space on the table top all around the layout.
    A display will just fit on a 36" wide table. On a 36" wide table the legs will be close to the edge on the front and back of the table.
    If the venue you are displaying at cannot provide 40" or 36" wide tables try for two 30" or 24" wide tables placed side by side.
    For larger corners you need a space that is or more two tables deep. Six foot tables placed side by side give enough depth for two two-foot corners and a straight module between them.
    Most shows provide eight foot long tables. This enough for a small display. Two end to end would make a good sized display. Tables usually come in four, six and eight foot (standard) lengths.
    If your display will span multiple tables then you must be prepared to handle varying table heights. A small supply of 1/8", 1/4" and 1/2" table shims are suggested.

    A Donut could be DC or DCC operated.

    Setup Guidelines for loop to loop

    A loop to loop display needs DCC. It would be very difficult to run with DC.
    One DCC system will be needed to operate the display. It should feed a power manager with two standard power sections and a power manager with two Auto-Reverse sections. One standard section will be used for each line of track. One reversing section will be used for each end loop.

    Setup Guidelines for Free Form

    The main difficulty here is the length of the tables and the fact that they are rectangular. Using shorter tables will allow for more flexibility in the display. Having a few bridge plates made of plywood will allow you to place tables at non right angles and fill in the resulting gaps.


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Last Modified: October 1, 2017. Copyright 2011-2017 W.R.Dixon.
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