Three different types of metro trains run on the metro lines of Helsinki.
Train units in both the M100 and M200 series consist of two motor carriages fixed together. The newest M300 metro trains are nearly 90 metres long and all the carriages have access to each other. There are a total of 46 metro train units (in the M100 and M200 series, a train unit refers to two pairs of carriages).
In traffic operations, trains with two pairs of carriages, i.e. a maximum of four carriages, are used.
To prepare for the West Metro, new metro trains were purchased. The trains in the M300 series are purchased from the Spanish rail equipment manufacturer CAF.
Series M100 train
The M100 series was designed, built and tested at the same time as the metro line. The metro trains were produced in Finland and they have proven to be very reliable and durable in use.
The oldest M100 series carriages are from 1977 and the most recent from 1984. Excluding the six oldest prototype carriages, the whole series was renovated between 2004 and 2009, and the metro trains will remain in use for another two decades.
Series M200 train
The M200 series was introduced at the turn of the millennium, when the extension of the Vuosaari track branch increased the need for vehicles. The trains were delivered by the rail equipment giant Bombardier and manufactured in Germany. For the passenger, the main difference compared to the old trains is the possibility of operating the carriage pairs independently of each other.
Series M300 train
Along the introduction of the West Metro and the new track section from Ruoholahti to Matinkylä, new vehicles were needed for metro transport.
To meet the needs of the growing metro traffic, Helsinki City Transport (HKL) ordered 20 four-carriage metro trains from the Spanish rail equipment manufacturer CAF. The first train was tested in 2015. The whole series was delivered in 2015 and 2016.
The trains in the M300 series are nearly 90 metres long, and all the carriages have access to each other. There is space for around 600 passengers. The carriages have air conditioning.