Volvo 745 taxi - madux
Seen outside a Swiss railway station last week, amongst all the brand new Mercs and Beemers, An absolutely immaculate 740 estate, complete with uniformed driver.
Dark metallic grey - showroom condition.
This car was replaced by the 940 in 1991 or 2 .
I feel like going back an asking him has he really had the same taxi for 17+ years!
Volvo 745 taxi - rtj70
The 9xx and 7xx Volvos were based on the same platform and existed at the same time. The 900 was the more upmarket one. Or so I thought.

Neighbour had a 960 with the powerful turbo engine, replacing a 7xx of some sort.

I assume your reference to being replaced was not a 940. 7 and 9 were the model (9 being the better) and 4 being 4 cylinder and 6 being 6 cylinder. Probably wrong.
Volvo 745 taxi - madux
Nope. 940s superceded the 740s. Look it up.
Either way that is very old for a taxi - still in immaculate condition too!
Volvo 745 taxi - rtj70
Don't forget the 960s :-) This makes sense apart from timelines.
Volvo 745 taxi - madux
960 replaced the 760, of course. In 1991 or 2.
Volvo 745 taxi - gordonbennet
IIRC when the 900 replaced the 7 series, apart from some minor facelifts and tinkering with the electrics/lights, the main improvements were SIPS and similar stuff.

I'm not at all surprised that one should still be in use as a taxi, my sister still has our '93 940 td estate, and despite many scrapes and scratches the body simply refuses to rust.
I keep my eye out for another td version, as simple a car as you'll find, except for trying to replace glowpug 5..;).