The current crisis of worldwide agglomeration and economic, spatial, and ownership factors, among others, mean that there is usually a shortage of new green areas, which are socially very beneficial. Therefore, various brownfields or degraded lands along public transport routes, e.g., tram lanes, are effectively transformed for this purpose. The significant potential of tram systems is that they can became a backbone of green corridors across the city. This case study of the Warsaw tram system (total length over 300 km of single tracks in service in 2019) enables us to simulate the potential growth of a biologically active area connected with an increasing share of greenery around tram lanes in Warsaw. Experience allows the authors to present the types of greenery systems based on existing and future tram corridors best suited for this city. The suggested usage of tram lanes as green corridors is in line with the generally-accepted concept of urban green infrastructure. Therefore, the aim of the authors is to present in a condensed fashion their views on a very important issue within the program of the revitalization of the Warsaw landscape by converting where possible the existing tram lines, as well as planning new ones according to the “green point of view”.

A new double-circuit tram route planned in Warsaw (V max = 70.0 km/h), running through the Praga Południe district from Waszyngton Avenue (Washington Avenue) to Gocław loop (total length of about 3.5 km), is designed to reduce the existing road load in this area of the access routes from outside Warsaw to the center of the capital, as well as to improve the conditions of transport service in the areas of Saska Kępa, Międzynarodowa housing estate, Kępa Gocławska and Gocław, thereby increasing the use of public transport in Warsaw. This paper concerns the first part of the planned investment-a new tram route on the section between Waszyngton Av. (Washington Avenue) and Stanów Zjednoczonych Av. (United States of America Avenue) in Warsaw, along the historical Exhibition Channel in its immediate vicinity (Saska Kępa). Specialists-constructors (Tramwaje Warszawskie Llc.) cooperated with landscape architects (Landscape Architecture Department, Warsaw University of Life Sciences-SGGW), in accordance with contemporary canons of sustainable urban development. They aimed at restoring proper proportions in the use of the area, taking into account functional aspects (optimal communication and various forms of recreation), natural aspects (preserving valuable vegetation and enriching resources), landscape aspects ("recovering" water as the main element of space) and reconstructing connections with adjacent areas (residential areas and allotments).