The phrase "a double track" is correct and usable in written English.
It can be used in contexts related to transportation, music, or discussions about parallel processes or approaches.
Example: "The railway system was designed with a double track to accommodate increased train traffic."
Alternatives: "a dual track" or "two tracks".
Two tunnel designs are considered: a cut-and-cover tunnel for a double track and a single-track tunnel dug with the New Austrian tunnelling method (NATM).
It is against this background that we should pursue a double track policy — redefining nuclear deterrence and the needed capabilities, and developing a concept for nuclear arms control which reflects current political objectives and strategic realities.
"The Iranians know we have a double track and they know that as a group we are solid both on the need to engage and the need to apply pressure," one European diplomat said.
At Carnegie Hill and at Lenox Hill, in the East 70's, a passer-by can peer down to giant arches of contrasting red brick and gray fieldstone spanning a double track, floodlit by Metro-North tunnel lighting.
In this paper the experimental results on the turbulence intensity levels at the catenary contact wires due to the presence of parapets placed on the sides of a double track bridge are presented.
Some of them have variable width (either simply-supported decks or continuous ones up to three spans), whereas other bridges are of variable depth, so they can reach 59 m for a double track section and 75 m for single track.
Is it possible to pursue a double-track pathway in winter, both in the Sciences and the Humanities?
Tests on a double-track section of the Mälaren line in Sweden demonstrates a significant potential for energy saving.
Max's adventure would be enough to fill any book, but Schulman sets herself an extra challenge by designing "Three Weeks in December" as a double-track novel.
The paper advocates a double-track strategy in cultural landscape development: first, some remaining traditional land-use systems should be preserved, and new tools for their economic viability be designed.
Though plans for a transport link from Boston to the Hudson River had first called for a canal tunnel to pass under the Berkshire Mountains, by 1855, when the Hoosac Tunnel was started, railroads had already established their worth, and the plans were changed to a double-track railroad bore 24 by 22 feet and 4.5 miles long.
