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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.
Modules built to non-standard lengths must also be built with consideration of the standard lengths; where appropriate, the modeler must also build a short bridge module so that their specific module set uses up a section of layout that is evenly divisible by 4-foot (1.22 m)-long modules.
There are six types of AMC cards ("Module") available. A Full-size Module is the most common, allowing up to 23.25 mm high components (from centerline of PCB). A Mid-size Module allows component heights maxed at 11.65 to 14.01 mm (depending on board location). A Compact Module allows only 8.18 mm.
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.
For example, a metric 2520 component is 2.5 mm by 2.0 mm which corresponds roughly to 0.10 inches by 0.08 inches (hence, imperial size is 1008). Exceptions occur for imperial in the two smallest rectangular passive sizes. The metric codes still represent the dimensions in mm, even though the imperial size codes are no longer aligned.
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The FMC specification has two defined sizes: single width (69 mm) and double width (139 mm). The depth of both is about 76.5 mm. [4] The FMC mezzanine module uses a high-pin count 400 pin high-speed array connector. A mechanically compatible low pin count connector with 160 pins can also be used with any of the form factors in the standard.
The station equipment interpreted this as the track is free and allowed another train in to proceed into the station, which then crashed into the previous train from behind. [12] June 22, 2009 Washington Metro train collision, which occurred when a parasitic oscillation developed in a track circuit control module. [4]