My Z Scale layout is very much the result of "trial and error":
much of what has materialized in the end happened to do so
because something else went wrong or didn't work at all -
or because I changed my mind.
Here's a brief account of how it all came together in the end.



With a scale ratio of 1:220 and a track gauge of a quarter of an inch (6,5mm), "Z" is the smallest commercially established electric model railway scale - making it only 72% the size of N Scale and a mere 40% of H0 Scale.
As a result, Z Scale offers the possibility of running trains in a confined amount of space which simply would not be possible in other modelling scales: the rather complex trackplan shown here only measures 24"x48" (60x120 cm) in Z Scale yet offers continuous running (even twice around) along with several spurs and the potential to model scenic variety.

You might just be able to shoehorn this into that space with N Scale but only by using very tight curves, markedly shorter straights, and foresaking much of the pointwork. And of course it would be absolutely impossible in H0.


Grey River Northern Trackplan (c) David K. Smith

It's almost something of a calling card for Z Scale - the small round-and-round layout, as Z Scale allows for continuous running on a full circle of track with reliable operation of medium and larger locomotives in an area of approximately 20"x20" (50x50 cm); tight curves and short rolling stock will even find sufficient space within the confines of a briefcase.
German toy and train manufacturers Märklin, the inventors of Z Scale, have almost always emphasized the smallness far more than the option to model more in the same given space in comparison to N and HO.

But unless you are into gimmicky micro layouts in odd places, it is in fact precisely this quality of being able to model more in the same given space which makes Z Scale shine.

Z Scale really suits any prototype, but when it comes to the typically long drags and hauls seen on North American rails, the space saving qualities become truly apparent.


A long Norfolk Southern train of covered hoppers rumbles through Downtown Roanoke Va in May 2017

Z Scale is ideal to replicate just that - long trains speeding by, trundling by or just waiting their turn to get back on their way from A to B. You can cut down on the size needed for a layout yet still go for longer trains than the larger scales would commonly allow on anything smaller than tracks taking up the better part of a basement.
  This is because the overall footprint over ties of Z Scale track is only half an inch (12.4 mm) for a single line of straight track.

The width required by a double track line is no wider than a mere 1.4 inches (36 mm), or 1.6 inches (40 mm) when using track with a permanent plastic roadbed base imitating ballast.



The small footprint even of a double track line in Z Scale lends itself perfectly to a modular approach - just the ticket for someone wanting a layout which is not permanently on display but easy to set up and dismantle again in a sensible amount of time.
This list of requirements (small, lightweight, straightforward) made me come across T-TRAK - a tabletop (hence the "T") modular system with individual modules which are substantially smaller than those of other module systems. The modules are easy to build, store, transport and set up, and can be used to form layouts ranging from a simple circle to large complex affairs.

Originally developed by N Scale modellers in Japan, the T-TRAK concept has also been adapted for HO and Z Scale, but given that I simply intended to have a modular layout which could be set up temporarily without much of a fuss I did not have to concern myself with the compatibility of parts of my layout with other modeller's modules - which is why I took the T-TRAK concept as a basis but introduced some changes according to my own preferences.



Z Scale offers the same basic types of track other modelling scales do: sectional track versus flex track, and standard track versus track with an integrated roadbed imitating ballast. Ultimately the choice will be a decision based on a specific layout’s requirements and needs as well as previous personal experience.

Rokuhan (the company name meaning "6.5" in Japanese, refering to the Z Scale track gauge of 6.5mm) introduced their Z Scale track in 2011; it features an integrated trackbed which simulates ballast, similar to Micro-Trains' Micro-Track in Z and Kato's Unitrack in N and HO. The rails are nickel silver and have an inverted H profile, aimed at providing better wheel to rail contact and thus current pick-up.


  The brand has become popular amongst Z Scale modellers due to the large and varied track geometry avilable; standard track pieces even come with either wooden or or concrete sleepers. Rokuhan track is, however, modelled on Japanese permanent way, which is closer to the European average of 2,640 ties per mile of track rather than the up to 3,000 ties on North American track.

This difference is visible, but ultimately it was a case of function over appearance in order to get the best operational results and the most planning flexibility possible for my US prototype modular layout. All in all, the compromise on visual aspects is not too big as careful ballasting and weathering of Rokuhan track goes a long way in disguising the "wrong" tie size and spacing.



The modules essentially assemble into an extended oval layout, designed for continuous single line running with a double track passing loop at one end, measuring 65cm (25.6 inches) in width across the corner modules.

Expansion is possible by simply adding additional intermediate modules (only two of which are pictured here for the sake of clarity). The basic layout can also be shrunk to a basic oval by using just the two corner modules, although this renders the inner line of the double track segment non-functional.

  An important aspect of the modular segments is a strict adherence to level track, resulting in no inclines of the track itself while the scenery around it may rise and fall in all directions. Overall, this not only results in smoother operation but also makes connecting modules a lot easier.

  For the corner segments there is the option of building 180 or 90 degrees segments, but in order to keep the number of module connections to a minimum I settled for one 180 degrees double track and one 180 degrees single track corner module, both falling easily in line with the required ease of building, carrying, setting up and storing.

The corner modules measure 450mm x 650mm, a size which allows the use of Rokuhan's extra-large radius curves plus a standard 110mm straight track attached to both ends of the curve in order to ease the travel of trains into them.

The straight modules have a depth of 250mm, which I found to be a good compromise between keeping down overall size and still provide some space for scenic modelling, especially on single track modules (the Australian T-Trak standard for Z is only slightly larger at 280mm).



All images and graphics are (c) A. T. Wymann unless labelled otherwise

page created 23 April 2012
page updated 7 July 2018