I. Premise for a oNeCAT module
There is an existing group and standard for operating live catenary in N scale - the
NCat group. NCat bases their modules on the NTrak standard and adds two lines
for traction operation. While this is a good idea for getting incorporated in train
shows, it is not prototypical operation. That is, not many traction lines operated
adjacent to a 3 track mainline with double track operation. After seeing Bernard
KempinskiÕs oNeTrak modules for DCC and branch line operation, I thought that
the same thing could be done for catenary operations. The modules will share
some specifications from both Ntrak and East Penn Traction Club, with some
modifications.
II. Module Sizes
As with NTrak or East Penn standards, the modules will be in various standard
sizes, though narrower than NTrak. The basic oNeCAT module size is one foot
wide by four feet long. Other acceptable size standard modules are the same
width and lengths of 2, 6 & 8 feet. While NCat specifies a minimum radius of 10Ó,
oNeCAT will use a minimum radius of 6Ó to allow for closer to prototype curves.
Corner modules should be at least 2 feet wide to provide a larger turning radius.
Return loop modules need to be at least 18 inches wide to provide edge clearances
on the 6Ó radius turns.
Special junction modules will be needed to bring the oNeCAT line from the NCat
modules. If the NCat module has a return loop, the junction module will need to be
at least 30Ó wide.
III. General Track Information
oNeCAT will have a minimum turn radius of 6Ó as mentioned above. In addition,
the trackwork should start 2.5Ó from the end of the module to allow for Atlas 5Ó
straight snap track to be used to assure proper joining of module track. The track
should be straight for at least the first 4Ó on the module ends (including the Atlas
track). There is no limit on switches or crossing in the oNeCAT line. Maximum
grade is to be 4% or less, with no grade in the 4Ó closest to the module end. Code
55 or larger rail should be used on the oNeCAT mainline, Code 80 can be used for
the NTrak mains and branch, while Code 40 can be used for sidings.
IV. Module Construction
oNeCAT modules are based on the East Penn construction practices for end joints
and a conglomeration of other standards for the framing and trackwork. Modules
should be constructed of #2 White Pine (or better grade) 1x3 lumber with a sub-
deck of 1/4Ó Luan or Plywood and a deck of either 1/2Ó Homasote or 1/2Ó foam (do
not use white foam - the ÒpebblyÓ kind). Be certain to use adequate amounts of
glue and square the module during construction. The deck will overhang the frame
by 3/8Ó on each end to allow for leg attachments similar to East Penn (see Fig. 1).
Fig. 1 Module End
Modules that will adjoin NCat or other N Scale modules should be built to the
above standards. Adapter legs with a 3/8Ó setback will be used for these junctions
(see Fig 2.). Bolts holes must be drilled through the NCat (or other) modules.
Fig. 2 Adapter Leg
The legs themselves will be stand alone units that can be mass produced in a jig
(see Fig. 3).
Fig. 3 Leg Units
Leg units are 12 inches wide and 37.5Ó long for standard modules. Bolt holes are
1/4Ó diameter and they are located 1.25Ó down from the top of the legs and 2Ó in
from the sides of the legs (8Ó between centers). Legs for return loop modules are
18Ó wide and have mounting holes located at 2Ó, 10Ó, & 16Ó from one side. Be
certain to drill matching holes in the return loop modules. Plywood gussets should
be used at all joints.
V. Track Specifics
oNeCAT track specifics are based on several standards, but are fairly open to
creative geometry. Standard spacing of track from the edge of the modules is 5Ó.
Any special geometry on the main tracks must be able to accommodate 50Õ cars
with ease. NMRA clearances should be adhered to, but height limits can set to
accommodate catenary at 18 to 23 feet above the rail. Track will be held back
from the end of the module by 2.5Ó following NTrak standards. oNeCAT will use
Atlas 5Ó Straight Track to join track between modules. The first 1.5Ó of track on
each module must be flat and straight. Any number of crossings and switches
can be used on the main. Sidings have no limits. Grades should be kept to 4% max
on the main line, no limits on non-main tracks. Minimum radius on the main is 6Ó
while non-main tracks can be tighter.
VI. Catenary Specifics
oNeCAT catenary follows NCat standards. All frogs on the main should be
manufactured to allow both pole and pantograph operation. IÊhave found that
some HO frogs will provide suitable operation of N scale shoes. Catenary at the
module ends should be terminated with a 00-90 brass washer approximately one
half inch from the end of the module. A piece of .020Ó brass wire is bent in a U
shape to connect between modules. This connector is also used to tension the
wire. Catenary height should be in the range of 18Õ - 23Õ above the railhead.
VII. Wiring Specifics
oNeCAT wiring is based on both NCat and NTrak specs. Provide 110VAC outlets
and 12VDC wiring under the modules following NTrak standards. Track and
catenary wiring follows NCat standards, using Cinch-Jones 4 pin connectors.
Throttles and power supplies from the NTrak handbooks can be used. It is not
recommended to use DCC controls. Research will be done to see if DCC can be
made compatible with oNeCAT. Using NCat wiring, three different circuits can
be used on oNeCAT track, with engines running on two of those circuits at any
one time. It is recommended that both rails be wired together and the modules be
controlled with blocks if operation does not include running two rail engines
(steam, diesel, or non-converted traction). Under table wiring should be 16ga for
12VDC wiring and 18ga for track wiring.
VIII. Scenery and Paint Specifics
No limits on scenery or paint. Any tunnel sections must be accessible for re-
railing or re-wiring trains.
Use your browser "Back" to get back to where you were!
or to
NCat Official Home Page