1. Tram track on the portal of tunnel is not drawn --- probably behind the backimage of tunnel
This seems to be common issue both Standard and Extended.
I checked this issue in pak.nippon with both Standard and Extended.
2. Track catenary behind terrain is drawn
I think No.2 is pakset issue.
Generally, the catenary pole and overhead wire on the tunnel entrance tile are hidden by the tunnel image. And the part which does not hide is displayed as it is.
The near side pole is not necessary(except for the terminal end:Image[N],Image[E],Image[W],Image{S]), and it should be supported from the near side tile.
For example, North to South catenary image(Image[NS]) need the north side of pole, but the south side pole not needed.
Sorry for my poor Eng
rish thing. "far side" and "near side" means:

Red position is the "far side". Blue position is the "near side".
pak.nippon : Catenary pole is on the far side.
pak128.Britain : Catenary pole is on the near side...
So in the pak128.Britain, the near side of tram wire pole cannot hide in the opposite side tunnel image.