Recently I have picked up an interest on the APT, especially due to the fact that Hornby released their new version of the APT after around 40 years.
I am planning to get the full 14-car APT, and I already got my hands on the 5-car set of the 2020 version.
However, scrolling through APT-related websites, I also found out that there were more plans on the APT if production versions were to be made. The APT-Q, aptly named so as it follows the letter P, basically uses the 14-car APT-P