Delta Trestle Bridge, Maryland and Pennsylvania Railroad

Delta Historic District is a national historic district located at Delta in York County, Pennsylvania. The district includes 137 collective buildings, mostly constructed between 1875 and 1895. The buildings are primarily frame and clapboard structures set upon a slate foundation and topped with slate shingle roof. They are reflective of a number of popular architectural styles including the Greek Revival and Late Victorian style. The use of slate reflects the prominence of that industry on the local economy.It was listed on the National Register of Historic Places in 1983.

Delta is a borough in York County, Pennsylvania, United States, and one of the southernmost communities in Pennsylvania. The population was 706 at the 2020 census. It is served by the South Eastern School District which provides a public education.

Cardiff is an unincorporated community in Harford County, Maryland, United States. The zip code for the area is 21160. The community name is taken from the Capital city of Wales.

Whiteford–Cardiff Historic District is a national historic district at Cardiff and Whiteford, Harford County, Maryland, United States. It encompasses portions of two communities in northern Harford County that were historically associated with slate production during the late 19th and early 20th centuries. It contains 140 contributing resources including four vernacular Welsh cottages dating to about 1850. The Whiteford–Cardiff area is noted for its strong Welsh ethnic identity, which is reflected in the architecture of the area.It was added to the National Register of Historic Places in 2005.

Slate Ridge School is a historic school located at Whiteford, Harford County, Maryland. The main block of the building is two stories, constructed of brick with a slate hip roof and a small wooden cupola in the center. It was built in 1912, and designed by the Baltimore architect Otto Simonson. A narrow hyphen containing a stairwell and corridor connects the main block to a similar two-story rectangular block and a one-story wing containing a stage and gymnasium, added just after World War II. It was used until about 1980.It was listed on the National Register of Historic Places in 1987.

Scott Creek Bridge-North, Maryland and Pennsylvania Railroad is a historic railroad bridge in Peach Bottom Township, York County, Pennsylvania. It was built about 1909. The girder bridge with stone abutments was built by the Maryland and Pennsylvania Railroad and crosses Scott Creek.It was added to the National Register of Historic Places in 1995.

Coulsontown Cottages Historic District is a national historic district located at Coulsontown in Peach Bottom Township in York County, Pennsylvania. The district includes four contributing buildings. They are stone cottages built between 1845 and 1865. They are two story dwellings, 2/3 by 1 bay, with slate covered gable roofs and end chimneys. There are two rooms downstairs and two rooms upstairs.It was listed on the National Register of Historic Places in 1985.

Whiteford is an unincorporated community in Harford County, Maryland, United States. The community has historically had a strong Welsh heritage, which is reflected in the local architecture. The town, a part of the Whiteford-Cardiff Historic District, was added to the National Register of Historic Places in 2005. Until 1978, this community was served by the Maryland and Pennsylvania Railroad at milepost 42.4. Also on the National Register are the Broad Creek Soapstone Quarries and Slate Ridge School.The populated place Cambria lies to the northwest of Whiteford.

Cambria is a populated place in Harford County, Maryland, northwest of Whiteford.Many slate quarries were in operation to the southeast of Cambria in the 1800s. The region was known as the Peach Bottom Slate area.

Bryansville is an unincorporated community in York County, Pennsylvania, United States. The village of Bryansville has a large residential area, known as Susquehanna Trails, almost adjacent to it. Until 1978, this community was served by the Maryland and Pennsylvania Railroad at milepost 45.9.

Peach Bottom Township is a township in York County, Pennsylvania, 60 miles (97 km) south of Harrisburg. The population was 4,961 at the 2020 census.Peach Bottom Township was so named on account of peach trees growing near a river bottom. Peach Bottom Nuclear Generating Station was built in 1958.

The Muddy Creek Bridge, Maryland and Pennsylvania Railroad is a historic Pratt through truss railroad bridge in Lower Chanceford Township and Peach Bottom Township, York County, Pennsylvania. It was built about 1909, and measures about 120-foot-long (37 m) overall. It was built by the Maryland and Pennsylvania Railroad and crosses Muddy Creek.It was added to the National Register of Historic Places in 1995.