Class Hk1, numbers 232 to 241, was built by Baldwin Locomotive Works in 1898. The ten Baldwin locomotives were originally designated H1 class. Numbers 291 to 300 and 322 to 333 were built by the Richmond Locomotive Works in 1900 and 1901. The 22 Richmond locomotives were originally designated H2 class and were nicknamed Big-Wheel Kaanari. One of them, No. 293, the locomotive that brought Lenin from exile in August–September 1917 prior to the Russian Revolution, was presented by Finland to the Soviet Union on 13 June 1957 and is preserved at the Finland Station in St. Petersburg, Russia. Another 100 of these locomotives were manufactured in Finland from 1903 to 1916, numbered in the range from 437 to 574 and initially designated H3 to H8 classes. The Class Hk5 was numbered from 439 to 515. One, No. 497, is preserved at Haapamäki. The Class Hv1 was built from 1915 by Tampella and Lokomo. They were nicknamed Heikki and were numbered 545 to 578 and 648 to 655. The class remained in service until 1967. One, No. 555 named Princess, is preserved at the Finnish Railway Museum. The Class Hv2 was built by Berliner Maschinenbau and Lokomo in the years between 1919 and 1926. They were numbered 579 to 593, 671 to 684 and 777 to 780. One, No. 680, is preserved at Haapamäki. The Class Hv3 was built by Berliner, Tampella and Lokomo in the years from 1921 to 1941. They were numbered 638 to 647, 781 to 785 and 991 to 999. Three Class Hv3 locomotives were preserved, No. 781 at Kerava, No. 995 at Suolahti and No. 998 at Haapamäki. The Class Hv4 was built by Tampella and Lokomo in the years from 1912 to 1933 and were numbered 516 to 529, 742 to 751 and 757 to 760. Two, numbers 742 and 751, are preserved at Haapamäki. The Swedish State Railways (Statens Järnvägar or SJ) sold its Class Ta and Tb locomotives to Finland in 1942. At the time, they were not in traffic in Sweden and, since they were purchased by Finland, they were not considered as war assistance. The Class Ta was designated Class Hr2 in Finland while the Class Tb was designated Class Hr3. The Class Hr2 was numbered from 1900 to 1906 and had been built by Swedish builders NOHAB (Nydqvist & Holm AB) and Motala Verkstad in the years from 1901