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Model Information: Kato Introduced it first TGV model in 1983, the 10-091 6-Unit set.

The box sets consist of either a push-pull engine pair with transition coaches and standard coaches and the "add-on" sets consist of standard coaches only. With the push-pull sets, typically one engine is powered and one is a dummy. Coupler types vary from set to set and some sets even carry different couplers for different parts of the train. Newer sets have removable noses for prototypically accurate "double" trains. All the sets contain movable pantographs but none are operating in the sense they cannot draw power to the engine from catenary wires.

The Kato model has evolved over the years. The early engines were typical of 90's vintage kato mechanisms and run smoothly and quietly. Later engines sport Kato's "shock-absorber" design for even quieter operation.
Though we have created only one body style so far for all the Kato TGVs, they are actually quite different one from each other, and not only from the visual aspect reflecting the various evolutions of the prototype; the internal mechanism has also evolved over years. The engines of the initial model of 1983 were quite light, the ones from Eurostar of 1995 were very hefty with a metal chassis leaving very few space for a decoder both in the motorized and dummy engines, the ones from the Thalys, POS et Duplex were mostly plastic with a too light dummy engine.
They come presented in various packaging: the 8-car sets in the large Kato bookcase box, the 10-car sets of the 2000-2010ish in a large box with Unitrack straight tracks for display, and the most recent - post mid-2010s - 10-car sets in 2 small Kato bookcase boxes (without track).

DCC Information: Only the most recent versions (from the mid 2010s) are factory-equipped with a NEM 651 6-pin decoder socket (but not the Eurostar).
However, all Kato TGVs, starting from the original 1983 version, are DCC friendly is the sense that the motor is isolated from the chassis, and the motor tabs are accessible from the top. They are all equipped with a circuit board (PCB) that can be modified to accommodate a wired decoder; meaning you have to cut a few traces, properly wire the LEDs (they are not always mounted the same way) and isolate the motor tabs.

For models released in the 2000-2010ish period, replacement PCBs equipped with 6-pin decoder socket were available as spare parts:
- For POS and Lyria: 14746-3G (M1 motorized engine) and 14755-3G (M2 dummy engine)
- For Thalys: K10918-25 (M1 motorized engine) and K10918-26 (M2 dummy engine)
The PCB costs as much as a decoder, and you still have to buy a decoder!

The Eurostar, even re-released in 2017, remains at the border of being DCC-Friendly, with very little room, just to install a small decoder like a Z-scale one.
Some [1] [2] report to have installed a Digitrax DN163K0A though after having replaced the LEDs by the ones from the original model and some modifications of the shell.
The Thalys is a bit more easier to digitalize, though still requiring to modify the PCB and solder a decoder; again some [3] have achieved to use a Digitrax DN163K0A, with modifications.

Prototype History: The TGV (French: Train à Grande Vitesse, "high-speed train") is France's intercity high-speed rail service, operated by the SNCF, the national rail operator. It was developed in the 1970s by GEC-Alsthom and the SNCF. Originally designed as turbotrains to be powered by gas turbines, TGV prototypes evolved into electric trains with the 1973 oil crisis. Following the inaugural service between Paris and Lyon in 1981 on the LGV Sud-Est (LGV for Ligne à Grande Vitesse; "high-speed line"), the network, centred on Paris, has expanded to connect main cities across France (Marseille, Lille, Bordeaux, Strasbourg, Rennes) and in adjacent countries on combinations of high-speed and conventional lines.

A TGV test train set the record for the fastest wheeled train, reaching 574.8 km/h (357.2 mph) on 3 April 2007. In mid-2011, scheduled TGV trains operated at the highest speeds in conventional train service in the world, regularly reaching 320 km/h (200 mph) on the LGV Est, LGV Rhin-Rhône, and LGV Méditerranée. Trains running from Paris to Marseille and Strasbourg can also reach 350 km/h (220 mph). According to Railway Gazette International reports in 2007, the world's fastest scheduled rail journey was a start-to-stop average speed of 279.4 km/h (173.6 mph) between the Gare de Champagne-Ardenne and Gare de Lorraine on the LGV Est, not surpassed until Railway Gazette International's 2013 reported average of 283.7 km/h (176.3 mph) express service on the Shijiazhuang to Zhengzhou segment of China's Shijiazhuang–Wuhan high-speed railway.

The commercial success of the first LGV, the LGV Sud-Est, led to an expansion of the network to the south (LGV Rhône-Alpes, LGV Méditerranée, Contournement Nîmes – Montpellier), and new lines in the west (LGV Atlantique, LGV Bretagne-Pays de la Loire and LGV Sud Europe Atlantique), north (LGV Nord and LGV Interconnexion Est), and east (LGV Est). Eager to emulate the TGV's success, neighbouring countries Italy, Spain, and Germany developed their own high-speed rail services. The TGV system itself extends to neighbouring countries, either directly (Italy, Spain, Luxembourg, Germany and Switzerland) or through TGV-derivative networks linking France to Belgium, Germany, and the Netherlands (Thalys), as well as France and Belgium to the United Kingdom (Eurostar). Several future lines are planned, including extensions within France and to surrounding countries. Cities such as Tours have become part of a "TGV commuter belt" around Paris. In 2007, the SNCF generated profits of €1.1 billion (approximately US$1.75 billion, £875 million) driven largely by higher margins on the TGV network.

From Wikipedia

Brand/Importer Information: MDC Roundhouse was founded in California in 1938 and relocated in 1993 to Carson City, Nevada due to statewide restrictions on painting. MDC Roundhouse was a producer of both RTR (Ready-to-Run) and kit versions of N Scale rolling stock as well as RTR locomotives. They entered the N scale market in 1979 with a Thrall Hi-Side Gondola and a Hi-Cube Single Door Box Car. MDC Roundhouse was purchased by Horizon Hobbies in June of 2004, when its owner since 1938 C. H. Menteer retired, and merged into their Athearn line.

Unlike many of their contemporaries which contracted with European firms to produce their products, MDC made their own toolings. They made several popular body styles and produced them for road names that many other vendors (even Micro-Trains) wouldn't touch. This made them popular with modelers. Also, their un-assembled "kits" permitted a lower price point so they were popular with "runners" as well as "modelers".

Of particular interest was the attention given to modern 50 foot steel boxcars. They made some attempt to accurately mold the differences into distinct models to represent each of the major prototype manufacturers products. They have distinct toolings not only for the different products from FMC, BFF and PS, but also multiple models for each of these manufacturers including "standard" vs "Youngstown" doors and "waffle" vs. "rib" sides. In total they produced 13 different versions of the 50 foot steel boxcar.