on conventional legacy lines. Unlike the steel-bodied 400 Series, the Class 395 has its carbody (walls, roof, floor) formed from friction stir welded (FSW) double-walled hollow extruded aluminium body panels, a technology that Hitachi Rail considers to be a part of its A-Train train family specification. The manufacturer claims that the FSW approach achieves minimal strain while providing a lightweight and high strength carbody in comparison to conventional techniques. Each Class 395 unit contains six cars, formed DPT1-MS1-MS2-MS3-MS4-DPT2. The intermediate cars carry the traction motors - one at each axle - while the unpowered outer cars carry the pantographs. The bogies are bolsterless, with both powered and unpowered bogies sharing a common design to simplify maintenance. Each six-car unit can work in multiple with another to create 12-car trains. The coupling process is automated and has been designed to take less than 60seconds. The propulsion system of the Class 395 comprises 16 electric motors each rated to produce that work in conjunction with four IGBT converter/inverter units. In combination with its braking system, it can achieve a peak acceleration rate of and a normal maximum deceleration rate of , although the latter can be elevated to under emergency circumstances. The train uses an electrically operated air brake system, supplied by Faiveley. Approximately 40% of the train's components were sourced from suppliers within the European Union. Each six-car train is fitted with 340 seats in 2+2 formation, all standard class, with an additional twelve tip-up priority seats located in an indicated wheelchair area near the vestibules of the DPT1 vehicle. There is no separation between the vestibules and the main interior save for wind shields. There are two toilets per unit, one of which is larger and designed to be universally accessible. The seats are mostly arranged 'airline' style, though there are also a small number of table seats present in each car. Nearly all seats feature flip-down tables and coat hooks, while a single electrical socket has been provided for each pair of seats. The interior design and layout is in conformance with the Rail Vehicle Accessibility Regulations 2010. The trains meet UK Railway Group Standards (RGS), and European Union Technical Specifications for Interoperability (TSI) standards for crashworthiness, and UK or EU standards for structure-load-bearing behaviour, material strength, aerodynamics, noise and fire resistance. Key areas of the train's design that were heavily influenced by these standards were its fireproofing measures