HKL signed a €113m contract with Transtech in December 2010 for 40 of the 27.6m-long three-section LRVs, which accommodate up to 199 passengers, 88 of them seated.

Two pre-series vehicles were introduced in August 2015 and the first production Artics were delivered to HKL last year. The remainder of the fleet is due to be delivered by 2018.