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Main article: Railroad classes
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In the United States, railroads are designated as Class I, Class II, or Class III, according to size criteria first established by the Interstate Commerce Commission (ICC) in 1911, and now governed by the Surface Transportation Board (STB). The STB's current definition of a Class I railroad was set in 1992, that being any carrier earning annual revenue greater than $250 million. This has since been adjusted for inflation and most recently set to $504,803,294 in 2019.

This is a list of current and former Class I railroads in North America under the older criteria and the newer as well as today's much different post-railroad consolidation classifications.

Many of the more famous historical small railways possessing key trunk lines have been merged into one of today's behemoths.

Current Class I railroads:[]

Today there are just five American owned Class I freight railroad companies and one passenger railroad company (Amtrak). The list also includes two Canadian owned Class I freight railroads, both of which have trackage in the US.

Former Class I railroads:[]

This list includes very varied financial entities. From completely defunct companies to operating companies with operations turned into investments, some hanging onto a corporate skeleton owning properties as holding companies, or have assigned their properties in mergers, bankruptcy or other legal acts (dissolution of the corporation) and finally others having become extinct—their works either torn up and hopefully recycled or sold off to operating companies. This list does not indicate which is which.

A:[]

B:[]

C:[]

D:[]

E:[]

F:[]

G:[]

H:[]

  • Hocking Valley Railway
  • Houston East and West Texas Railway
  • Houston and Texas Central Railroad

I:[]

K:[]

L:[]

M:[]

N:[]

O:[]

  • Oahu Railway and Land Company
  • Oklahoma City-Ada-Atoka Railway
  • Oregon Electric Railway
  • Oregon Railroad and Navigation Company
  • Oregon Short Line Railroad
  • Oregon-Washington Railroad and Navigation Company

P:[]

Q:[]

R:[]

  • Reading Company
  • Richmond, Fredericksburg and Potomac Railroad
  • Rutland Railroad
  • Rutland Railway

S:[]

T:[]

  • Tennessee Central Railroad
  • Tennessee Central Railway
  • Texarkana and Fort Smith Railway
  • Texas Mexican Railway
  • Texas and New Orleans Railroad
  • Texas and Northern Railway
  • Texas and Pacific Railway
  • Toledo and Ohio Central Railway
  • Toledo, Peoria and Western Railroad
  • Toledo, Peoria and Western Railway
  • Toledo, St. Louis and Western Railroad
  • Trinity and Brazos Valley Railway

U:[]

V:[]

W:[]

  • Wabash Railroad
  • Wabash Railway
  • Wabash Pittsburgh Terminal Railway
  • Washington Southern Railway
  • West Jersey and Seashore Railroad
  • Western Railway of Alabama
  • Western Maryland Railway
  • Western Pacific Railroad
  • Western Pacific Railway
  • Wheeling and Lake Erie Railroad
  • Wheeling and Lake Erie Railway
  • Wichita Falls and Northwestern Railway
  • Wichita Falls and Southern Railroad
  • Wichita Valley Railway
  • Wisconsin Central Railroad
  • Wisconsin Central Railway

Y:[]