Smart-N Module Standards
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1 Smart-N Module Standards Current as of June 8, Basic Information 1.1. What is Smart-N? Smart-N ("Smart" stands for "Smaller Modules Are Readily Transportable") is an N-scale modular layout standard. Designed around small basic modules and a two-track mainline, Smart-N attempts to minimize the hassle involved in building, storing and (especially!) transporting modules. Smart-N is an independent standard; it does not rely on any other modular standard to provide additional specifications. This document contains the complete Smart-N standard Who maintains the Smart-N standard? The Smart-N standard is maintained by the Meade Area Railroad Society (MARRS), a model railroad and railfan group located in Laurel, MD. The standard was originally ratified by MARRS in May 1998, and the latest version of the standard is available at the MARRS web site: Authority of the Standard This standard is entirely voluntary. Compliance with the standard does not guarantee acceptance of any given module into any given Smart-N layout. Conversely, non-compliance does not guarantee rejection. However, if a module is intended to work as part of a Smart-N layout, compliance with these standards is the best way to avoid problems Additional Information A companion document to these standards, the Smart-N Module Design Guide, is also available at the MARRS web site listed above. The Design Guide offers suggestions for designing modules that meet the Smart-N standards.
2 2. Interfaces An interface is a side of a Smart-N module at which it may be connected to another Smart-N module, to form a continuous run of mainline track Mechanical An interface must be placed on a straight side, at least 6.00" wide. To avoid interference with neighboring modules, no part of the module may extend past the plane of the interface. The total thickness of a module at an interface, from top of railhead to bottom of frame, must be between 3.75" and 4.50". The height of the framing at the interface must be at least 1.50"; the thickness must be between 0.50" and 1.00". (This is to ensure that modules can be clamped together.) The nominal height of a Smart-N module at an interface, from floor to top of rail, is 40.00". To account for uneven floors, the module's design must permit this height to be continuously adjustable between 39.00" and 41.00" Trackwork At each interface, there must be two tracks designated as mainline tracks. The mainline tracks must end between 62.5mm (2.46") and 63mm (2.47") from the interface (for this measurement, the metric values are preferred). At this point, the centerlines of the two tracks must be 1.25" apart, and the direction of travel must be perpendicular to the interface. If the mainline is set on roadbed, the roadbed must continue straight from the end of track to the interface Additional Equipment For each interface on a module, the owner must provide one C-clamp of 2.00" to 3.00" capacity, and one straight 5" (nominal) piece of Atlas Snap-Track. 2.4 Alternate Interfaces It is possible to design Smart-N modules that also interface to other N-scale modular standards (NTrak, Bend-Trak, etc.). Such interfaces are beyond the scope of these standards.
3 3. Trackwork 3.1. Rail All mainline track must be standard-gauge Atlas flex track (code 80), or other track with compatible rail and tie geometry. No hand-laid track is permitted on the mainline. Recommended: All other track should be at least Code Curvature The minimum radius for the mainline is 17.00". Recommended: No curves of less than 11.00" radius should be used. All mainline curves of less than 19.00" radius must begin and end with either an appropriate easement or a 15-degree curve segment of 19.00" radius. All S-curve situations on the mainline must incorporate at least 4.90" of tangent (straight) track between the curves Turnouts and Special Trackwork All turnouts used in mainline crossovers, and all turnouts where the mainline passes through the diverging portion of the turnout, must be at least #6, except "wye" turnouts which must be at least #5. All other mainline turnouts must be at least #4.5. Recommended: All turnouts should be at least #4. Any crossing of the mainline at an angle less than 10 degrees must use a "movable-point" crossing or double-slip turnout. Gantlet track is not permitted on the mainline Clearances Clearances above and around mainline tracks must meet or exceed the current NMRA N-scale clearance gauge. Recommended: Test your clearances with an 89-foot tri-level auto carrier to ensure that large, modern equipment will clear. Parallel track centerlines on straight mainline track must be at least 1.20" apart. Recommended: Parallel mainline tracks will usually be on 1.25" centers. Parallel track centerlines on curved mainline track must be at least 1.50" apart. Recommended: On curves of 90 degrees or less, this can be accomplished by using the same radius on the "outside" track as on the "inside" track, and offsetting the center of the curve to compensate. On curves of more than 90 degrees, the outside track could be on the same center as the inside track but with a 1.50"-greater radius, and offset curves used at both ends to transition from the tighter parallel-track spacing Grades Grades on mainline track must not exceed 2 percent. Recommended: Mainline track should be level except in situations (such as flyover junctions) where a grade is unavoidable. Other grades should be kept under 6 percent if possible.
4 3.6. Unprotected Edges The centerline of a mainline track must never be less than 2.25" from any unprotected edge of the module. An interface is considered protected when attached to another module. Other edges may be protected by placing obstructions between the edge and the mainline. These obstructions must extend at least.50" above the railhead, and must be sufficiently "solid" so that a standard-height boxcar cannot pass through any gaps Accessibility The centerline of a mainline track must never be more than 24.00" from the nearest accessible edge. Any tunnel or similar situation over 6.00" long must incorporate a means of ready access to the track.
5 4. Electrical 4.1. Wiring Standards All mainline wiring must be at least 18 gauge, except track feeders of less than one foot in length which may be as small as 24 gauge. All mainline wire junctions must be electrically solid (soldered, crimped, or screwed to a terminal) and properly insulated. Twisted-and-taped junctions are not acceptable. All electrical switches used in mainline wiring must be visible and accessible to a standing or seated operator. However, it is permitted for such switches to be concealed by removable scenery when not in active use. When viewed from the interface, wiring for the left-hand mainline will be color-coded red for the left rail and black for the right rail; wiring for the right-hand mainline will be color-coded black for the left rail and red for the right rail. (Thus, the four mainline rails will be colorcoded red-black-black-red, from left to right.) 4.2. Connector Blocks Each interface must have four spring or European-style block connectors, capable of accepting 18 gauge wire, arranged in a straight line to form a "connector block." The connector block must be parallel to and within 6.00" of the interface, arranged horizontally so that when viewed from the interface, the relative left-to-right positions of the four connectors correspond to the positions of the four mainline rails. Recommended: The connector block will usually be on the inside of the frame at the interface. Each connector block must be equipped with two "pigtail" leads, each consisting of a length of 18-gauge, two-conductor wire, fitted with redblack pairs of PowerPole connectors. The leads should be long enough to extend between 6.00" and 12.00" beyond the end of the module when pulled taut. Recommended: if red/black zip cord is available, it should be used, with the colors matching the PowerPoles. The leads for each pigtail must be attached to the connector block to correspond to one of the mainline tracks, matching the color coding of the mainline wiring. The PowerPoles on the pigtail for the left mainline must be paired red-over-black, and the PowerPoles on the pigtail for the right mainline must be paired black-over-red.
6 4.3. Isolation Electrical isolation between sections of track must be accomplished by means of insulated rail joiners in both rails. Air gaps are not acceptable. Mainline tracks must be electrically isolated from each other. This will usually be required at mainline crossovers, or where mainlines are connected end-to-end to form a loop. Non-mainline track must be electrically isolated from mainline track. Recommended: On any module with more than four feet of mainline distance between interfaces, the interfaces should be electrically isolated from each other Connectivity The connector block at each interface must be electrically joined to the mainline tracks at that interface. (Note that the actual wire connection does not have to be at the interface; it must simply be connected electrically without passing through a switch or other isolation point.) Each of the four mainline rails is joined to its corresponding connector, as determined by relative position (frontmost rail to frontmost connector, etc.). Each mainline track connecting two interfaces must be accompanied by a double-pole switch that can be used to override the isolation between the interfaces for that track (if such an isolation exists). If there are mainline track sections that are isolated from all interfaces, a double-pole switch must be used to allow the section to be connected to an interface. (There can be no "dead spots" on the mainline that cannot receive mainline power.) Recommended: if two switches are used, one for the interface at either end, then the section can be "reassigned" between the two interfaces and becomes quite handy for dispatching purposes.
7 5. Scenery 5.1. Skyboards If a skyboard is used, it must not exceed 12.00" in height above the lowest mainline trackage on the module. Recommended: most skyboards will be made of 12.00"-wide material, which will then be overlapped with the back of the frame, resulting in a skyboard height of 8-9 inches Cut-off Scenery All cut-off scenic features (mountains, streams, etc.), on any side of the module, must present a flat surface along the plane of the cut. If this surface will be visible from the normal viewing direction, it must be painted a low-gloss (matte, flat, satin, or eggshell) black. Recommended: all visible portions of the frame should also be painted low-gloss black, to avoid drawing attention to the cutoff Other Scenery All modules should have at least basic scenery completed before being displayed publicly.
8 Appendix A: Anderson PowerPoles An Anderson PowerPole connector is a single-conductor connector, made up of a metal contact wiper surrounded by a plastic shell. The shells are available in various colors. Each connector has a C-shaped "hood" and a rectangular "peg" molded into it. By convention, the hood is the "top" of the connector and the peg is the "bottom." An electrical connection is made by turning one PowerPole upside-down relative to another and pushing them together end-to-end; therefore, there are no "male" or "female" PowerPoles. PowerPole connectors are available in different amperage ratings, based on the size of wire they are designed to accept. For example, 15-amp PowerPoles accept gauge wire; 30- amp PowerPoles accept gauge wire. The 15-, 30-, and 45-amp versions use the same shell, and can be freely intermixed. Higher-rated connectors are progressively larger, and cannot be intermixed. The connectors are keyed so that they may be interlocked, either vertically or horizontally, to form multi-connector "blocks." For connectors joined vertically, they may be described as being one "over" the other. For example, a pair of PowerPoles "paired red over black" would refer to a red connector, attached to the top of a black connector. (Please note that "over" refers only to how the connectors are joined to each other. If a "red over black" pair is turned upside down as a unit, it's still a "red over black" pair.) Red and black PowerPole shells, and a contact wiper. Note the "hood" and "peg" on each shell. PowerPoles joined "red over black." Note the hood and peg positions.
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