Volvo used to have a last digit for the number of doors: 142 and 242 had two doors, 144 and 244 had 4 and 145 and 245 hade 5; i.e. they were wagons. After the 940 series, which actually came before the 850, they usually stopped to put in the last digit, except for the wagons.
The 240 is a bit boring but very reliable and safe, like an old faithful dog. I have had two of them.