Since its debut, T6A5 was made in three versions, most changes made were minor and were mostly visual as vehicle's electronics and mechanics remained unchanged.

First revision
The First revision (noted as T6A5/I) is the oldest revision, featuring red-cream livery and classic gray-cream colored interior.

Second revision
Second revision (noted as T6A5/II) is minor revision and only featured improved wheel slide protection, different pantograph and tilt sash windows.

Third revision
Third revision (noted as T6A5/III) saw renewed livery, redesigned interior, doors, driver's air conditioning, plastic seats with textile coating, new pantograph and electronic information displays.

T6A5.3
The T6A5.3 is modification of classic Tatra T3 to T6A5 using new replacement chassis and old parts and bogies from T3.
This was an experiment in Prague made to find a cheaper ways to restore fleet.
Only one vehicle of this kind was built in 1998, but due to its atypical origin, it was not operated in regular service because of low reliability.
In August 2012 the vehicle was scrapped.
Since its debut, T6A5 was made in three versions, most changes made were minor and were mostly visual as vehicle's electronics and mechanics remained unchanged.
First revision
The First revision (noted as T6A5/I) is the oldest revision, featuring red-cream livery and classic gray-cream colored interior.
Second revision
Second revision (noted as T6A5/II) is minor revision and only featured improved wheel slide protection, different pantograph and tilt sash windows.
Third revision
Third revision (noted as T6A5/III) saw renewed livery, redesigned interior, doors, driver's air conditioning, plastic seats with textile coating, new pantograph and electronic information displays.
T6A5.3
The T6A5.3 is modification of classic Tatra T3 to T6A5 using new replacement chassis and old parts and bogies from T3. This was an experiment in Prague made to find a cheaper ways to restore fleet. Only one vehicle of this kind was built in 1998, but due to its atypical origin, it was not operated in regular service because of low reliability. In August 2012 the vehicle was scrapped.
Tatra T6A5