Porter Subdivision
railway line in the United States of America

The Porter Subdivision is a railroad line owned by CSX Transportation in the Chicago, Illinois, area. Formerly a part of the main line of the Michigan Central Railroad, it now connects CSX's former Baltimore and Ohio Railroad line and the Chicago Fort Wayne and Eastern Railroad from the east with the Indiana Harbor Belt Railroad towards Blue Island, Illinois.
History
The Michigan Central Railroad built a line from Detroit, Michigan, to Chicago, Illinois, opening in mid-1852, several months after the competing Northern Indiana and Chicago Railroad (later the New York Central Railroad's main line) was completed. The MC's path entered Indiana near Michigan City, crossing the NI&C at Porter. From Porter it looped to the southwest and northwest, joining the Illinois Central Railroad in the Kensington neighborhood of Chicago. Later the Michigan Central (and the Northern Indiana and Chicago's successor, the Lake Shore and Michigan Southern Railway) came under control of the New York Central.
Eventually the NYC started to operate most trains west from Porter via the LS&MS, and the MC became a secondary route. All passenger trains moved on January 18, 1957, ending service to local stations in Gary and Hammond. In 1968 the NYC merged into Penn Central Transportation, and into Conrail in 1976. Around then the diamonds were removed at Porter, physically separating the line to Detroit from the line to Kensington, which came to be known as the Porter Branch.
The public source identifies “Porter Subdivision” as railway line in the United States of America. This brief keeps that definition visible, then builds a research path around Porter, Subdivision and railway.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Porter Subdivision”, the useful work is to connect “railway line in the United States of America” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Dec 8, 2025. The linked authority identifier is Q7231658. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1852, 1957, 1968 and 1976.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Porter Subdivision”, its source revision and the description used here.
- Expand the search: follow Porter Subdivision primary sources, Porter Subdivision archive and Porter research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Porter Subdivision”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Porter Subdivision” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.