The standard nationwide time for making changes was 3:01 a.m. Eastern Standard Time, which would be 12:01 a.m. Pacifc Standard Time, still on Sunday. (A day does began at 12:01 a.m.; it's not just a style issue.)
I lived in a small place that had terminal-per-line SxS. Terminal per line means that the line is designated by a number; an additional number is required to desginate the party and the number is listed in the directory that way without any hyphens or other distinctions.
All the party lines were in the same connector group.
Later terminal-per-station became the standard, where each terminal on the connector designates an individual station. So a two-party line would require two terminals (and two directory numbers), a four-party line would have four terminals (and four directory numbers) and an eight-party line would require eight terminals (and eight directory numbers).
This much simplified intercept and regrouping. In most offices any terminal could be jumpered to any ringing bus in the terminal, so it could be the ring party at one time, after regrouping or other changes it could be made the tip party, and in offices with full selective four-party ringing any terminal could be connected to any of the ringing buses -- postive tip, positive ring, negarive tip, negative ring.
[ ... ]The shortages went back to the Great Depression of the 1930s, when capital spending was necessarily reduced and indeed with the loss of customers and lack of construction there was little need for capital expenditures.
The outside plant was usually the limiting factor--an individual copper pair was needed for each line. After World War II (during which construction and capital spending was almost non-existent) there were many cable routes that had not been reinforced since before the Depression. When the end of the war came, there were suddenly new housing developments, new business and industrial construction,. and heavy new demands for service. Their magnitude was such that the sudden change for little demand to furious demand could not be met overnight, both because of the finite funds available for capital spending and the very real limits on production capacity.
So did many other new developments all across the U.S.A.
Wes Leatherock snipped-for-privacy@aol.com