The Tatra KTNF6 is a modernized tram, type KT4, rebuilt with a central low-floor segment.

These types of tram cars are used in Cottbus, in Brandenburg City and Schöneiche-Rüdersdorf, Germany, and in Tallinn, Estonia (as KT6TM).

Another similar variant of KT4 is KTNF8 (also called KT4NF), which is used in Gera (Germany).

[4] These trams have new interiors, chairs, doors and middle sections with low floors.

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