Editing Plymouth Meeting, Pennsylvania (section)

===20th century===
For most of their existence, the trolley lines were operated by the Reading Transit & Light Company (no relation to the Reading Railroad). In addition to passengers, during the 1910s freight was handled by the RT&L trolleys; an abandoned wooden track-side freight platform near the northwest corner of Germantown Pike and Butler Pike survived into the 1950s. The Harmanville Dinkey was replaced with buses in 1927. The Germantown Pike trolleys ceased operation in December 1931. The trolley that ran from Norristown to Conshohocken through Black Horse, Seven Stars and Harmanville was replaced with buses in September 1933.<ref>Harry Foesig, ''Trolleys of Montgomery County Pennsylvania'', 1968, ASIN: B0029HAHZU (no ISBN)</ref> The roadside trolley tracks were quickly torn up and the adjacent two-lane Ridge Pike, and Butler Pike south of Ridge Pike, were widened to accommodate ever-increasing motor vehicle traffic.

The first school in the township was established by the Plymouth Meeting Society of Friends in 1780, although some records indicate an earlier school. A school was established at Cold Point in 1821. Public schools, established under the system authorized by the legislature in 1834, included Cold Point School, Plymouth Valley School, the Eight Square school, the Sandy Hill school and the North Star school.

Plymouth became a township of the first class in January 1922. Isaac J. Sheppard became township secretary from that time until his retirement in 1952. Under the new form of government the board changed from "road supervisors" to "Township Commissioners".

In 1925, the Board of Health was organized. [[Plumbing]] inspection began in 1934. In 1939, Plymouth adopted a "modern" [[zoning]] ordinance. A [[building code]] ordinance was adopted. In 1947, the first [[subdivision (land)|subdivision]] ordinance was adopted. In 1952, the Township Planning Commission was created, and a Recreation Committee was established to study recreation needs.

Plymouth Township adopted a Home Rule Charter in 1972. This allows a municipality to take any governmental or administrative actions it requires, unless such actions are prohibited by general laws of the [[Pennsylvania|Commonwealth]].

The [[Plymouth Meeting Historic District]], [[Alan West Corson Homestead]], [[Plymouth Friends Meetinghouse]], and [[Hovenden House, Barn and Abolition Hall]] were listed on the [[National Register of Historic Places]] in 1971.<ref name="nris">{{NRISref|version=2010a}}</ref>