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((Short description|Czech tramcar type))
((Multiple issues|
((Expand Czech|Tatra T3|date=December 2012))
((More citations needed|date=September 2018))
))
((Use dmy dates|date=April 2021))

((Infobox train
| background = #B11018
| name = Tatra T3
| image = Průvod tramvají 2015, 22a - tramvaj 7292.jpg
| imagesize = 280px
| caption = Tatra T3SUCS in Prague
| interiorimage = Brno, vozovna Medlánky, Tatra T3 (01).jpg
| interiorcaption = Interior of old version
| manufacturer = [[ČKD]] Tatra
| assembly = [[Prague]], Czech Republic
| family = Tatra
| service = 1960–present
| yearconstruction = 1960–1997
| yearservice = 1960
| numberbuilt = 13,945 + 131 bodies
| predecessor = [[Tatra T2]]
| successor = [[Tatra T6A5]]
| capacity = 110 / 95 (T3SU)
| carlength = ((convert|14000|mm|ftin|frac=8|abbr=on))
| width = ((convert|2500|mm|ftin|abbr=on|frac=8))
| height = ((convert|3050|mm|ftin|frac=8|abbr=on))
| doors = 3 / 2 (T3SU)
| maxspeed = ((convert|65|km/h|mph|abbr=on))
| weight = ((convert|16000|kg|lb|abbr=on))
| enginetype = TE022
| traction motors = 4
| poweroutput = 4×40 kW
| electricsystem = 600 V DC
| collectionmethod = [[Pantograph (transport)|pantograph]]
| wheels driven = 8
| coupling = Albert
| gauge = ((Track gauge|sg|lk=on)),<br />((Track gauge|1000mm|lk=on)),<br />((Track gauge|1524mm|lk=on))
))
[[File:Straßenbahn Chemnitz, Endhaltestelle Hutholz.jpg|thumb|Modernized Tatra T3D trams in Chemnitz, Germany]]
[[File:Riga Tatra 30917 on route 7 (21113376063).jpg|thumb|Multiple unit system of Tatra T3A in Riga, Latvia]]
[[File:MTTA tram in Moscow.jpg|thumb|right|Tram modernized from T3SU to MTTD on the historic [[Boulevard Ring]] tram line in [[Trams in Moscow|Moscow]]]]
[[File:Praha, smyčka Výstaviště, tramvaj T3 Coupé (8).jpg|thumb|T3 Coupé in Prague]]
[[File:Brno, Město Brno, Moravské náměstí, Tatra T3R.jpg|thumb|[[Tatra T3R]] in Brno, Czech Republic]]
[[File:Tram_K3R-NT_Plzen_Czech_republic.JPG|thumb|Three-unit tram [[Tatra K3R-NT]] in Pilsen, Czech Republic]]
[[File:Tatra T3D (1397).jpg|thumb|Tatra T3D (1397) in Dnipro, Ukraine]]
[[File:Tatra T3 - západ slunce.jpg|thumb|Tatra T3 in Ostrava, Czech Republic]]
The '''T3''' is a type of Czech tramcar produced by [[ČKD Tatra]]. A late-2000s study conducted on the [[Prague tram system]] has shown 98.9% [[Reliability (engineering)|reliability]], the best of the Prague tram system fleet.<ref>((Cite web |last=Šitner |first=Roman |date=2011-02-24 |title=Nový model tramvají Porsche je nejporuchovější ze všech. Každá sedmá stojí |url=https://byznys.hn.cz/c1-49833350-novy-model-tramvaji-porsche-je-nejporuchovejsi-ze-vsech-kazda-sedma-stoji |access-date=2024-01-11 |website=Hospodářské noviny (HN.cz) |language=cs))</ref> During its period of production between 1960 and 1999, 13,991 powered units and 122 unpowered trailers were sold worldwide.

It became the most dominant tramcar model in [[Eastern Bloc]] countries, except for Poland, where locally produced trams from [[Konstal]] factory are still the mainstay in tram systems there, and Hungary, where ČKD only made inroads to the country's tram market during the late 1970s. Together with Soviet [[KTM-5]] it is among the most produced trams, it is still in 2022 the most widespread tram car in the world.<ref>((cite news |title=V pražských ulicích dojezdila po padesáti letech poslední tramvaj T3 |url=https://www.idnes.cz/praha/zpravy/v-prazskych-ulicich-dojezdila-po-padesati-letech-posledni-tramvaj-t3.A111219_155542_praha-zpravy_ab |work=iDNES.cz |date=19 December 2011))</ref><ref>((cite news |title=Historické dopravní prostředky: Tramvaj T3 ((!)) MPO |url=https://www.mpo.cz/cz/e-komunikace-a-posta/postovni-sluzby/emise-znamek/znamky-vydavane-v-roce-2015/historicke-dopravni-prostredky-tramvaj-t3--163165/ |work=Mpo.cz |date=22 September 2021))</ref>

== Types ==
=== T3 ===
The design of the T3 had to meet difficult specifications.  The cars needed to have the same capacity as its predecessor (the [[Tatra T2]]), but be easier to build. Some of the things that were done to meet this goal were making the walls thinner, and fitting the cars with laminate seats instead of cushioned leatherette seats such as the T2 used. The T3 was delivered to all tramway companies in the former [[Czechoslovakia]]. It was most numerous in [[Prague]], where over 1,000 vehicles were delivered. The T3 still forms (mostly in various modernised versions) the backbone of the Czech tram fleet.

=== T3SU ===
('''SU''' for [[Soviet Union]])
As with the T2SU, the first T3SU was delivered with the modification of removing the middle door and replacing it with seats. Later cars, however, were delivered with the third door in place. Again, the vehicles had a closed operator's compartment and were adapted for the harsh climate. Altogether 11,368 T3SU were delivered, making it the largest production of a single type of streetcar worldwide. But because so many of one type were made, their replacement by more modern cars was slow.

The T3SU was delivered from 1963, first to Moscow and later to 33 further Soviet cities.

==== T3SUCS ====
('''SUCS''' for Soviet Union-modified [[Czechoslovakia]])

Originally, the production of the T3 was stopped in 1976 and focus shifted to newer vehicles. The Slovak city [[Košice]], however, ordered two motor coaches as an exception. The production of the replacement type [[Tatra KT8D5|KT8D5]] was slated to begin in 1985, but this model was by then obsolete. Further production of the T3 would have been too expensive, so instead vehicles of the type T3SU were re-imported and adapted. The closed operator's cab was maintained, the vehicles had all three doors in place, and differed from the original T3 only in a few details.

====T3SU Evolution====
Over time, the T3SU has had minor changes in both exterior appearance and interior design.

Exterior details:
* <1966: Narrow passenger windows disappeared
* ~1969: Narrow window route designators
* 1980s: Illuminated route  indicator on top
* ~1985: Oval turn indicator at the front became two rectangular lights. The same lamps began to be fitted to the rear
* 1983 onwards: Small grid in the forward section of the tram on the left side
* ~1985: Two small red lamps near the tramcar-to-tramcar "control circuit port",  both front and rear
* Additional red horizontal lamps from behind

Interior:
* Early 1960s to early 1970s: Sofa-style seats
* Early 1970s to mid-1980s: "Toilet"-like seats
* 1977–1978: Cream-coloured saloon  (repainted yellow/dark-blue)

=== T3D ===
('''D''' for [[Deutschland]])

In [[East Germany]] the first three T3D cars started operation in 1964 and the city of [[Dresden]] got its first delivery in 1965. The cars were used in part due to their width of ((convert|2.50|m|abbr=on)). They operated as single cars or as multiple units (motor+motor, motor+motor+trailer) and/or as mini trams (motor+trailer). The use of trailer cars was due to the use of original Czech T3 electrical equipment, which had enough power to support trailer cars. However, due to reduced available power, the maximum speed of the streetcar reached only 55&nbsp;km/h instead of the usual ((convert|65|km/h|abbr=on)).

Only German and Yugoslav networks had trailer cars. The car was designated as B3D and had the same body as the T3D. Today, only [[Chemnitz]] uses T3s in full service as the T3D-M (modified).

=== T3YU ===
('''YU''' for [[Yugoslavia]])

From 1967 onwards, vehicles supplied to Yugoslavia differed from the standard type T3 by having different [[pantograph (rail)|pantograph]]s and trucks. In addition, trailer cars were used, as in East Germany. Uncommonly, the network used [[loading gauge|narrow-profile]] vehicles, two of which could be found in Czechoslovakia and one in the Soviet Union.

=== T3R ===
('''R''' for [[Romania]])

At the end of the 1960s, Romania ordered RA cars as part of an agreement in the [[Comecon]]. The first vehicles came in 1970 to the city of [[Galați]] and had different electrical equipment from the Czechoslovak vehicles, to use the network's 750 V DC voltage. Since the carbodies were built too wide for use elsewhere, they remained in Galați. Only 50 units were delivered. Romania then opted for the narrower [[Tatra T4]], which had more success, being still used in Bucharest as of 2019.

A few more of the same type were manufactured in 1997.

=== T3RF ===
('''RF''' for Russian Federation)

Four Tatra T3RF were the very last T3 trams built. They were made for Samara and Izhevsk, but only Samara bought them. In 2002 the two others were sold to Brno and modernized.

===Modernized Tatra-T3 trams===
In most Czech cities and in some others such as [[Bratislava]], Moscow, [[Riga]], and [[Odesa]], Tatra-T3 trams became very common. As a result, service and maintenance workers became very experienced at servicing them. This was one reason for modifying existing trams rather than replacing them with newer stock (the other being cost).

Modernization normally includes: 
* Restoration of the car body
* Digital/Electronic destination sign installation
* Audio information system
* Installation of new [[traction motor]]s
* [[Thyristor]]-controlled motor traction system
* Refurbishing of the interior, which varies by city and transport authority
* Pantograph replacement (depending on the transport authority)

More radical modernization includes insertion of a [[low-floor]] section (e.g., [[Tatra K3R-NT]]).

Modernisations of Tatra T3:
* Tatra T3R.P – IGBT Transistors TV Progress
* Tatra T3G – TV-8 thyristors
* Tatra T3R.PLF – Body changes in the middle (low floor part)
* Tatra T3M.3 – electrical equipment TV-14
* Tatra T3M.2-DVC – added the ability to open doors by buttons for passengers 
* Tatra T3.04 
* Tatra T3R.PV
* Tatra T3R.PVO – Changed front and back mask, same electrical equipment as T3R.P
* Tatra T3R – Body changes and TV-8 thyristors

==References==
((reflist))

==External links==
((commons category|Tatra T3))
* [http://www.strassenbahnen-online.de/tatra/t3/ Tatra-Strassenbahnen] (DE)
* [https://web.archive.org/web/20071011123437/http://www.volgograd.ru/metrotram/en/ Volgograd metrotram: T3 showroom] Web3D world with Tatra T3 model

((TatraTram))
((Authority control))

[[Category:Tatra trams]]
[[Category:Tram vehicles of Croatia]]
[[Category:Tram vehicles of the Czech Republic]]
[[Category:Tram vehicles of Germany|Tatra T3D]]
[[Category:Tram vehicles of Latvia]]
[[Category:Tram vehicles of Romania]]
[[Category:Tram vehicles of Russia]]
[[Category:Tram vehicles of Ukraine]]
[[Category:600 V DC multiple units]]

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