Thorton Colby CST40

The  is a vehicle manufactured by Thorton in.

Overview
The wagon car is very similar to the Colby C125, with some minor differences, most notably its sporty wheels.

Although it's possible the car is somewhere, it has yet to be found.

Colby C240T
Considering the Database image is the same as this car's model, and the similarities in the name, the CST40 is very likely to be the C240T.

As with other versions, this one is labeled as "gt" in the files, meaning it was supposed to be a better and superior version than the standard model. That the quest to buy the C125 is called C240T instead, and that the Database image shows the CST40, indicates - as with other vehicles - that V was supposed to acquire the superior version, but in the end it was changed to be a C125. Examples of this can be found with the ARCH Nazaré being originally a Racer, or the other way around like with the Archer Quartz EC-T2 R660, which the quest says it's a Quartz EC-L R275 instead.

As of patch 1.2 they are resolving these issues, as the Mizutani Shion MZ1 was introduced as a lesser version of the MZ2.