This is a Faller H0-scale kit to assemble one tunnel portal; comes in 4 parts (2 side wings, and two upper arch sections) plus a sheet of brick-patterned card to line the tunnel, allowing construction as a single or double-track tunnel mouth.
The item is new and unused (although I've owned it for several years); the box has only been opened to take photos.
Designed to be high enough to accommodate overhead electric wires.
Vendor ref 1957