A short animation I did to test blending 2D grease pencil with 3D elements.
All assets modeled by me in Blender and rendered in EEVEE
Blender Grease Pencil and 3D Model
Full view of the final animation setup. The train was animated along a path, with a three camera used for different shots. One on the outside that follows the train, and two in the station pointing stage left, and stage right.
Mesh view of the subway train.
Material preview inside the subway train. All elments were parented to the train.