Impossible Road/Railroad Connection.
Specifically at Tunnel Connection Tiles, I am unable to intersect a "Two-way road" over a "[Closed] Railroad Connection Tile". However, if I place a "Two-way road", FIRST, over an "[Open] Tunnel Railroad Connection Tile", then I can intersect a "Railroad Track" over the "Two-way road" (this being intersecting on the "Railroad Connection Tile" itself).
My recommended solutions for the developers:
(1) Allow the bulldoze tool to remove Road/Railroad tiles on all CONNECTION TILES.
-or-
(2) Allow "Roads" to intersect ALL "[Closed] Railroad Connection Tiles" with the road/railroad merge command.
Additionally, a "Railroad Track" CAN intersect a "[Closed] ROAD Connection Tile". I request the same be made true vice versa. Building order matters in this example, when it shouldn't, in order to allow full flexibility in City Layout Design.