Prime Minister Najib Tun Razak announced that the four-car trains will only be fully operational by the end of 2012. On 30 December 2009, 3 of the 35 new four-car trains entered commercial service. In addition to increased capacity up to 950 passengers per trip, new features included seat belts for wheelchair-bound travelers, door alarm lights for hearing impaired, and more handles for standing commuters. Innovia ART 200 Mid-Life Refurbishment In June 2012, several 2-car Innovia ART 200 trains underwent major refurbishment work done by from Hartasuma Consortium. Known as Mid-Life Refurbishments (MLR), these refurbishments include an updated livery, changes of the LED headlights and interior lights, and interior refurbishments such as newer seat design and the installation of additional infotainment systems. Facilities were also added, such as openable windows during emergencies. The first MLR set, TR08, entered service on 15 October 2014. In 2017, another MLR project included two 2-car sets permanently coupled to form a 4-car set, known as the 'married train'. Interiors were similar to the previous MLR sets with added TV panels at each end of the sets, dynamic route map displays and walkable through gangways between the two sets. The first coupled train, TR87 (previously TR22 and TR27), entered service on 29 December 2017, with the remaining undergoing delivery in stages. KLAV Innovia Metro 300 Under the Kuala Lumpur Additional Vehicle programme, the new generation Bombardier Innovia Metro 300 started service in June 2016. Each driverless train features a new design for the end caps, a curved sidewall structure, and a larger, more spacious interior. All trains come in a four-car configuration with each car accommodating up to 220 passengers. Low energy consumption is achieved through a combination of lightweight aluminium car shells and a LIM propulsion system. Furthermore, the vehicle's regenerative braking enables the reuse of energy released during braking. The aisles and walk-through gangways are also wider when compared with the previous fleet. In addition, the trainsets are equipped with 16 cameras on board, infotainment LCD screens, dynamic route maps, better air-conditioning and bigger windows. With the new trains, the line could increase its capacity by 20 to 30 percent. An additional 27 new trainsets are being delivered. As of August 2020, three have arrived with two of them under installation. They were delivered for the first time by air using an Antonov An-124, one of the largest cargo planes in existence. The