Scale Standard Gauge Modular
Adopted on September 8, 2003
Edited on October 29, 2006
Edited on June 29, 2013
Edited on April 18, 2015
Last Edited on April 24, 2016
Modules shall be constructed with light weight materials, with a foam
core, furnature grade plywood ends, and luan facia and backdrops.
Modules ended up being built with 3/8"
plywood, instead of luan. Using luan, and building up T and I beams
added complexity to the construction process, without removing
The important concept is
that the modules should be sturdy enough to be moved for shows, and
light enough that they can be easily managed.
Straight modules shall be no longer than 6 feet, and no wider than 3
For ease of constructions,
two of our corners are built from two 2x6 modules, connected as an
"L". Another two corners are built from two 2x4 modules, and two
corners are built as a 4x4 "L". The latter corners fit together
"tetris-style" into a 4x6 footprint for shipping. One additional
corner is a 5x4 "L"
The backdrop shall be 18 inches high.
To date, we have not built backdrops
on most of the new
modules. Backdrops will be built later, and designed
to be attached after the layout is assembled. Since the new modules are
designed so they can be flipped around, we don't want a permanment
backdrop obscuring the view during a show. When setup at the Clubhouse,
backdrops separate Franklin from Lebanon.
The top of roadbed shall be 40 inches, with adjustable supports that
allow the modules to be lowered to 38.5 or raised to 41.5 inches.
All track measurements are made
from the front, or viewing side of the module, to the centerline of the
track. All mainline track shall be code 100 nickel silver. Mainline
tracks shall be set back three
from the end of the modules.
The first 6 inches of track shall be straight, creating a twelve
inch straight transition between posible reverse curves. Rail joints,
turnouts, shall be soldered.
All track clearances shall conform to NMRA Modern Clearanc
Mainline turnouts shall be no
smaller than #6
#8. Smaller sized turnouts may be installed to serve
industry sidings, provided that mainline trains do not travel through
the diverging route.
Mainline Turnouts shall be powered with slow-motion, stall type switch motors, or hand-thrown with Caboose
Industries hand throws.
A single mainline track shall
interface between modules, and be laid 7 inches (centerline) from the front
module. Modules that are expected to interface with standard NMRA
modules shall have a second track, laid 5 inches (centerline) from the
front of the module. Multiple modules that connect together to
a scene, need only comply at the ends that connect to other modules.
See our newly written Evolution of Wiring
document for an
historical perspective, plus up to date wiring guides.
The track power bus shall be
constructed with 12gauge wire, terminal strips, and spade connectors.
Short 24gauge wire shall be used for track feeders. Two-pin
connectors shall be used for each mainline between modules. Heat-shrink
tubing, or paint on electrical
insulation shall be used to cover solder joints.
Gaps, or insulated rail
joiners, shall be installed across both rails within the module; solid
rail jointers shall be used between modules. A "gap-switch" shall
be installed, which when in the closed position shall allow power to
flow through the module.
This may sound like a good idea, but in practice it adds complexity to
the design, and could result in failures if the switch was changed
during layout operations. We'll continue to use insolated rail joints
at the end of the module, and unplug the track bus. Section houses have been installed on
the layout to indicate where the gaps are located.
Circuit protection shall be
installed in such a manner to prevent a single short from shutting down
the entire layout. We're still
relying on the multiple booster outputs for short circuit protection.
Special Purpose Modules
Two 6 x 6 foot corners to be
at joint CVMRRC/CMRC meets
Four 4 x 4 foot
corners to be used at small shows, similar to the NH History
Museum, and Pemi Valley Shows.
The Concord Yard is made up
compliant modules to be used for interfacing with
the Bedford Boomers, or similar group.
Both track and wiring!
We've never done this...
Two six foot modules that
two feet of single track, and four feet
of double-track, meeting the NMRA spec at the interface. When
so that the two NMRA ends join, the modules will form an eight-foot
siding. Optionally, we could build the NMRA ends with all four tracks,
a four track "yard" when connected.
We have decided to use the four-track yard configuration, and model
that to be the northern terminus of our Concord to White River Junction
sectional layout. The yard will roughly be the Westboro frieght yards.
Jon Miner's two loops,
each taking up 7x10 foot floor space are DCC compliant, with built in
reversing units. The loops can be used by themselves, or with any
number of modules inbtween. The loops support both single and
The module owner is responsible for providing two clamps and two joiner sections per module.
All track clearances shall conform to NMRA standards.