Mixing Double and Single Track
Because double and single track may use different signalling systems, it may be awkward and confusing to mix double and single track too often. For example, intermediate mechanical signal boxes on a double-track line can be closed during periods of light traffic, but this cannot be done if there is a single-line section in between. This problem is less serious with electrical signalling such as Centralized traffic control.
Read more about this topic: Double Track
Famous quotes containing the words mixing, double, single and/or track:
“Political image is like mixing cement. When it’s wet, you can move it around and shape it, but at some point it hardens and there’s almost nothing you can do to reshape it.”
—Walter F. Mondale (b. 1928)
“You know, when these New Negroes have their convention—that is going to be the chairman of the Committee on Unending Agitation. Race, race, race!... Damn, even the N double A C P takes a holiday sometimes!”
—Lorraine Hansberry (1930–1965)
“Treating ‘water’ as a name of a single scattered object is not intended to enable us to dispense with general terms and plurality of reference. Scatter is in fact an inconsequential detail.”
—Willard Van Orman Quine (b. 1908)
“Away went the messenger’s bicycle,
His serpent’s track went up the hill forever.
And all the time she stood there hot as fever
And cold as any icicle.”
—John Crowe Ransom (1888–1974)