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)
“Actually being married seemed so crowded with unspoken rules and odd secrets and unfathomable responsibilities that it had no more occurred to her to imagine being married herself than it had to imagine driving a motorcycle or having a job. She had, however, thought about being a bride, which had more to do with being the center of attention and looking inexplicably, temporarily beautiful than it did with sharing a double bed with someone with hairy legs and a drawer full of boxer shorts.”
—Anna Quindlen (b. 1952)
“Keep out of Chancery.... It’s being ground to bits in a slow mill; it’s being roasted at a slow fire; it’s being stung to death by single bees; it’s being drowned by drops; it’s going mad by grains.”
—Charles Dickens (1812–1870)
“The most difficult crime to track is the one which is purposeless.”
—Sir Arthur Conan Doyle (1859–1930)