Blank Space Between a Book's Two Facing Pages

This page is the CodyCross answer for the clue below from Train Travel, Group 708, Puzzle 1 (Operating Companies).

Question is: Blank Space Between a Book's Two Facing Pages

and the answer is: GUTTER

Word Meaning:

GUTTER — A prepared channel in a surface, especially at the side of a road adjacent to a curb, intended for the drainage of water.

Definitions from Wiktionary.

Blank Space Between A Book's Two Facing Pages - Train Travel CodyCross Answers | CodyCross Solutions