| IRR |
 |
Iron Rail Road Co. |
|
| IRr |
|
Indianola Railroad Co. |
|
| IRr |
|
International Railroad Co. (The) |
|
| IRy |
|
Indiana Railway Co. (The) |
|
| IRy |
|
Indiana Railway Co. (The) |
|
| IRy |
|
Interstate Railway Co. (The) |
|
| IRy |
|
Iron Railway Co. (The) |
|
| I&B |
|
Indianapolis and Bellefontaine Railroad Co. (The) |
|
| I&C |
|
Indiana & Chicago Railway Co. |
|
| I&C |
|
Indianapolis and Cincinnati Railroad Co. |
|
| I&GNRr |
|
International and Great Northern Railroad Co. (The) |
|
| I&GNRy |
International and Great Northern Railway Co. |
|
| I&I |
|
Indiana and Illinois Railway Co. |
|
| I&L |
|
Indianapolis & Louisville Railway Co. |
|
| I&M |
|
Indiana and Michigan Railroad Co. |
|
| I&M |
|
Indianapolis and Madison Railroad Co. |
|
| I&M |
|
Iowa and Minnesota Railroad Co. |
|
| I&O |
|
Indiana & Ohio Railway Co. |
|
| I&SI |
|
Illinois and Southern Iowa Rail Road Co. (The) |
|
| I&StLRr |
|
Indianapolis and St. Louis Railroad Co. |
|
| I&StLRy |
Indianapolis and St. Louis Railway Co. (The) |
|
| I&StL |
|
Iowa & St. Louis Railway Co. |
|
| I&V |
|
Indianapolis and Vincennes Railroad Co. |
|
| I&W |
|
Illinois and Wisconsin Railroad Co. |
|
| I&WN |
|
Idaho & Washington Northern Railroad Co. |
|
| I-GN |
|
International-Great Northern Railroad Co. |
|
| I-S |
|
Inter-State Railroad Co. (The) |
|
| IB&W |
|
Indiana, Bloomington & Western Railway Co. |
|
| IBC |
|
Indiana Block Coal Railroad Co. |
|
| IC |
|
Illinois Central Railroad Co. |
 |
| IC |
|
Indiana Central Railway Co. (The) |
|
| IC&LFRr |
|
Indianapolis, Cincinnati and La Fayette Railroad Co. (The) |
|
| IC&LFRy |
Indianapolis, Cincinnati and La Fayette Railway Co. |
|
| ICG |
|
Illinois Central Gulf Railroad Co. |
|
| ID&C |
|
Indianapolis, Delphi and Chicago Rail Road Co. |
|
| ID&W |
|
Indiana, Decatur & Western Railroad (way?) Co. |
|
| IGT |
|
Illinois Grand Trunk Railway Co. (The) |
|
| IH |
|
Indiana Harbor Railroad Co. |
|
| IHB |
|
Indiana Harbor Belt Railroad Co. |
|
| II&IRr |
|
Indiana, Illinois and Iowa Railroad Co. |
|
| II&IRr |
Indiana, Illinois and Iowa Railroad Co. (The) |
|
| II&IRy |
Indiana, Illinois and Iowa Railway Co. of the State of Indiana |
|
| IM&NP |
|
Iowa, Minnesota and North Pacific Railway Co. |
|
| IN&S |
|
Indiana North and South Railroad Co. |
|
| IP |
|
Illinois Parallel Railroad Co. |
|
| IP&C |
|
Indianapolis, Pittsburgh and Cleveland Railroad Co. |
|
| IS |
|
Indiana Stone Railroad Co. |
|
| IS&MN |
|
Iowa Southern and Missouri Northern Railroad Co. (The) |
|
| IStM&E |
|
Iberia, St. Mary & Eastern Railroad Co. |
|
| ISW |
|
Iowa Southwestern Railroad Co. (The) |
|
| IT |
|
Illinois Terminal Railroad Co. |
|
| IT |
|
Interstate Transfer Railway Co. |
|
| IU |
|
Indianapolis Union Railway Co. |
|
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