From Harlon City Server

The P-stock is a class of rolling stock that are running on metro lines M3 and M31 in New Harlon. The stock has an appearance similar to that of older London Underground cars, with a green front, top, and doors, white sides, and a blue frame. It has 4 headlights on it, 2 main ones, and 2 smaller ones, as well as a rollsign on the top. The train was revealed on May 9th, 2021 along with the release of the 15th NH Early Access Pass.