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T-TRAK (all letters capitalized) is a modular model railroad system based on standards for module size, track placement, track interface, and electrical connections. The standards allow for a wide range of flexibility in design yet still maintain interoperability with all modules built per the standards.
oNeTrak is designed around the concept of a single track mainline and as such allows for a greater range of railroad scenes to be modeled compared to Ntrak. oNeTrak also allows for more prototypical operations as trains on a single track main often have to meet and/or pass each other during operation of the layout.
Using 32 mm (1.26 in) - 0 gauge - track, there is an extensive range of 16 mm to the foot scale [1:19] live-steam and other types of locomotives, rolling stock and accessories. Many of these models are dual gauge, and can be converted to run on 45 mm (1.772 in) track , and radio control is common.
T-TRAK, [19] is a modular system that uses table-top modules, 2 + 3 ⁄ 4 inches (70 mm) high, which set on tables, that are not part of the modules, but are often found at sites which members meet. It uses a specific track interface, which has joiners which hold the modules together, which enables quick setting up and taking down.
There is little evidence that the dimensions of these early racks were standardized. Telephone equipment racks (1923) The 19-inch rack format with rack-units of 1.75 inches (44.45 mm) was established as a standard by AT&T around 1922 in order to reduce the space required for repeater and termination equipment in a telephone company central ...
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The connectors in Zone-3 are user defined and are usually used to connect a front board to a Rear Transition Module. The Zone-3 area can also hold a special backplane to interconnect boards with signals that are not defined in the AdvancedTCA specification. The AdvancedTCA Fabric specification uses Logical Slots to describe the interconnections.
Each module has three input and output pins, for +4db, -2dB and negative balanced signals. The physical dimensions are 3U vertically (5.25") and multiples of 1.5" wide, with 15-pin edge-connector pin configuration of 500-series modules.