The train was manufactured by ABB/BREL from 1991 to 1994. It came with DC Motors at first, and when it entered service in 1993 to 1995 to replace the already aging 1962 Stock, people were amazed of this train: The automatic announcements, the ATO (Automatic Train Operation), it was "the future" for 1993... but that did not last very long. Criticism came when glitches started appearing, alongside some doors not closing, and people were like "Bring back the ones that actually worked...", so because of that: The Central Line was closed to fix all the issues. Eventually, all the problems were solved, and the line reopened. In 2011 to 2012, Alstom (GEC Alsthom) "refreshed" the trains as part of the Central Line Improvement Programme (CLIP), and gave them new PID (Passenger Information Display)'s, changed the cab controls, gave a slight change to the front face, and changed the interior. But then in the 2020s (I don't know what year), Alstom (GEC Alsthom) refreshed the trains AGAIN, and gave them AC Motors, changed the voice for the announcements, gave scrolling text to the interiors, and added 2 Wheelchair bays (You can see them in 2 tube cars). Another thing: After a tragic derailment in 2011 on the Central Line, TfL limited the speed from 100 Km/h (62 Mph) to 85 Km/h (53 Mph).

Extra:

When the Waterloo & City line was still operated by British Rail, there were trains called the "Class-482". These trains were formed of 4 Driver Cars (1992 Stock), and at the time, they had NSE Branding, Blue Doors, Red Handles on the interior, and a blue front, eventually, the Waterloo & City line was bought by London Underground LLC, and they lost the NSE Branding. In 1994 to 1996 (Maybe?), they got London Underground Branding, but instead of a red circle and a blue stripe: It was a blue circle and a red stripe. Eventually in 2004 to 2006, they finally got converted to Red Doors, Red front (They even at some point got a text that says "Waterloo & City line" on a teal background), they got correctly colored Handles (Red to Teal, which was the line's color), and got a multi-purpose bay (Not a wheelchair one).

Differences between the Central Line and the Waterloo & City line trains:

Central Line:

AC Motors (Replaced DC Motors as part of CLIP)

Used to have armrests (But because of the work hours, they were stolen)

Scrolling text in the Interior

Red Handles

Wheelchair Bays

Waterloo & City Line:

DC Motors (Due to less crazy work hours)

Has the armrests they came with

No scrolling text in the Interior

Teal Handles

Multi-purpose bay (Not Wheelchair)

Long, right? And I actually typed all of this myself, no AI slop involved!