They were not put into service in Jablonec, because of an ongoing discussion on whether to keep or not to keep the track width of 1,000 mm (3 ft 3+3⁄8 in), nor in Prague, where the cars were considered too wide.

The cars differed from the Czechoslovak version, particularly by the removal of the middle door, making room for more seats.

Removal of the middle door was hence required by contractors to avoid free-riders.

Modernization included overhauling of electrical equipment (similar to Tatra T3) and some changes in the car body.

These trams have been bought by Prague and after reconstruction are in daily use on the retro line 23.