VR Class Rro comes from a word RautatieRakennusOsasto which is the RailwayConstruction Department.The narrow gauge locomotive Rro 2 which is at the Finnish Railway Museum was originally used by TVH (the road engineering board) and numbered as TVH locomotive 5. Later (probably in 1926) it was transferred to VR Group and numbered 2 by the VR Railway Construction Department. The VR Railway Construction Department was established in the early 1920s.