Konstal 105Na

105Na is unidirectional motor tramcar, equipped with four doors. It is a development of the earlier Konstal 105N. The main changes being a shift in the location of the electrical equipment from under the steps to the back wall of the driver's cabin, the introduction of a separate cabin for the driver, as well as the removal of the small windows under the front and side windscreens. The most important change was the introduction of motor grouping, which reduced the energy consumption by 12%. During initial acceleration, the four motors are connected in series, whilst at higher speeds, two groups of motors are connected in parallel. While in service, the 105Na vehicles were the subject of various modifications and upgrades (including changes in the electrical system, new front plastic, change of the door opening mechanism, and even re-design, for Poznań, to the bidirectional Konstal 105NaDK). Almost all 105N cars in Poland have over time been modernised to the 105Na standard. == Other variants ==

The Konstal 105Na and 805Na trams provided the basis for the production of a large number of prototypes and variants: • 105Nb - new doors and bogies, 15 units built in 1988-1993 • 105Nb/e - slightly modified electrical system, 6 units built in 1994 • 105Ne - slightly thicker walls, 18 units built in 1993 • 105Nf - modernised brakes and drivers console, 44 units built in 1994-1996 • 105Ng - three doors, static converter and modified breaks, 2 units built in 1993 additional units obtained by modernising 105Na • 105Nm - similar to 105Nf but with a static converter, 14 units built in 1996-1997 • 105Np - static converter, single unit built in 1994 • 105NT - thyristor based, 13 units built in 1985–1989, later converted to standard 105Na • 105Nz - thyristor based and asynchronous motor, 2 units built in 1997 • 105N1k - similar to 105Ng but thyristor based, 3 units built in 1995 • 105N1k2 - similar to 105N1k but with electrical systems from a different supplier, 60 units built in 1995-2000 • 105N2k2000 - similar to 105N1k2 with a plastic front and rear, 36 units built in 2001 • 106N - thyristor based, 7 units built in 1977–1987, later converted to standard 105Na • 106Na - thyristor based, 8 units built in 1991-1993 • 805Nb - meter-gauge version of the 105Nb • 805NS - meter-gauge with new accelerator, 12 units built in 1984-1990 • 111N - with doors on both sides - two 111N cars connected back-to-back could work as a bidirectional tram, 6 units built in 1993 == Production numbers ==

The number of standard-gauge version 105Na vehicles produced is 1443 while the number narrow-gauge version, the 805Na, is 691. == Operators ==

These trams were used in all Polish cities which operate a tram system and they are the largest group in the stock. Konstal 105Na 805Na (Metere Gauge) == Gallery ==

File:Konstal 105Na tram cockpit, Wrocław.jpg|Cockpit of 105Na (new style) File:WK14 Pulpit sterowniczy Konstal 105Na.JPG|Cockpit of 105Na (old style) File:105Na wnętrze RB3.JPG|Interior File:Konstal 105NaD.jpg|High floor is one of the main drawbacks of 105Na File:105N wahadło.jpg|105NaDK - a bidirectional variant in Poznań File:111N.jpg|Konstal 111N with doors on both sides File:105Nz-2028.jpg|Konstal 105Nz File:105N2k-2120, Warszawa, 2014-08-21 (Muri WK14).jpg|Konstal 105N2k2000 - one of the last produced File:105Na wroc.JPG|A modernised 105Na in Wrocław File:Konstal 105Na ZURek (front).jpg|A modernised 105Na in Ruda Śląska File:Konstal 105Na ZURek (rear).jpg|A modernised 105Na in Ruda Śląska - rear view File:Konstal 105Ng2015 in Szczecin, Poland, 2016 (cropped).png|A modernised 105Na in Szczecin File:Tram wroclaw.JPG|A modernised 105Na in Wrocław File:Gdańsk Zaspa pętla tramwajowa i Konstal.JPG|A modernised 105Na in Gdańsk File:Fgg.jpg|105Na undergoing modernisation File:PL Warsaw Konstal 105Na tram.jpg|A Konstal 105Na in old... File:Nowowiejska (tramwaj 74).JPG|...and new Warsaw livery File:Wrocław Tramwaj. Konstal 105Na Tram nr 2400 ,Linia 0,November 1989 - Flickr - sludgegulper.jpg|105Na in Wrocław in 1989 File:Wrocław - Konstal 105Na MPK 2246 2015-12-26 13-56-46.JPG|105Na in Wrocław, 2015 File:Roch, Poznan, 105Na.JPG|105Na in Poznań, 2015 File:Warszawa summer 2015 005.JPG|105Na in Warsaw, 2015 ==References==