From Wiki (thanks!)
N scale is a popular model railway scale. Depending upon the manufacturer (or country), the scale ranges from 1:148 to 1:160. In all cases, the gauge (the distance between the rails) is 9 mm or 0.354 in. The term N gauge refers to the track dimensions, but in the UK in particular N gauge refers to a 1:148 scale with 1:160 (9 mm or 0.354 in) track gauge modelling. The terms N scale and N gauge are often inaccurately used interchangeably, as scale is defined as ratio or proportion of the model, and gauge only as a distance between rails. The scale 1:148 defines the rail to rail gauge equal to 9 mm or 0.354 in exactly (at the cost of scale exactness), so when calculating the rail and/or track use 1:148 and for engines and car wheel base use 1:160.
What is N-NTrak?
We are an N-Trak club, which means we operate a modular layout to the N-Trak specifications. For more information on N-Trak, visit their web site ntrak.org
From the official NTrak site: NTRAK Modules are tables that “C” clamp together to form large N scale train layouts at conventions, shopping malls, club rooms, and as home layouts. The basic module is two feet wide, four feet long, and 40″ high. There are adjustment bolts in the legs with a two inch adjustment range. The three tracks are common to all modules and the same electrical connectors are used on all modules. This makes setting up layouts a quick job. There are optional sizes and track locations to give a great deal of flexibility to the system. Specifications for the modules are covered in detail in the 20 page NTRAK Module Manual” and in the 100+ page “The NTRAK Module ‘How-to’ Book“. These and other books on N scale modeling are available from the NTRAK Store.
Our club links individual modules to create a large layouts. Since the modules all have common connection, we can move the layout as needed. We set up and tear down quickly. You can catch a video of the set up on our youtube link.
We run with DCC which allows us to run multiple trains on the same line with individual control. Multiple engines can pull the same train – if they are speed matched and have working couplers! It is great to match 3 or more engines pull an 8 foot long train.