Private company

Eastern Idaho Railroad

American railroad (1993–)

The Eastern Idaho Railroad (reporting mark EIRR) commenced on November 21, 1993, as a collection of two disconnected clusters of former Union Pacific (UP) branches. A subsidiary of Watco, EIRR operates two segments that move more than 35,000 carloads per year to the Union Pacific, with interchanges at Idaho Falls on the Northern Segment, and Minidoka on the Southern segment. The annual income is reported as being under 25 million dollars.2 It is part of Watco Companies.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 20, 2026.

Overview

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EIRR
Photo: Steve Spring, CC BY 2.5, via Wikimedia Commons4

The Eastern Idaho Railroad (reporting mark EIRR) commenced on November 21, 1993, as a collection of two disconnected clusters of former Union Pacific (UP) branches. A subsidiary of Watco, EIRR operates two segments that move more than 35,000 carloads per year to the Union Pacific, with interchanges at Idaho Falls on the Northern Segment, and Minidoka on the Southern segment. The annual income is reported as being under 25 million dollars. Potatoes are a major commodity carried, using a unique loading technology to minimize damage during transit.2

Corporate structure

Eastern Idaho Railroad is part of a group headed by Watco Companies. 20 entities, 2 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from subsidiaries, stakes and holdings from Wikidata (CC0); major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

Products and brands

The Southern segment

The Southern lines consist of:

UP's former Twin Falls Branch (Minidoka to Buhl, 74 miles)

UP's former North Side Branch (Rupert to Wendell, 57 miles)

the Raft River Industrial Lead (Burley to Declo, 9 miles)

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the Oakley Industrial Lead (Burley to Martin, 11 miles).

All lines connect for a total of 152 miles (245 km). Operations are based out of the ex-UP depots at Twin Falls and Rupert. The southern segment interchanges with UP at Minidoka, Idaho.

The Northern Segment

The Northern lines consist of:

Union Pacific's former (Utah northern) main line in Idaho Falls (5 miles)

the Yellowstone Branch (Idaho Falls to Ashton, 52 miles)

the St Anthony Industrial Lead (Saint Anthony to Egin, 12 miles)

the Goshen Industrial Lead (Ammon to Lincoln Junction, 4 miles)

the East Belt Branch (Newdale to Orvin, 38 miles),

the West Belt Industrial Lead (Ucon to Menan, 10 miles).

All lines connect for a total of 119 miles (192 km), served by four locomotives (August 2023), with operations based out of an office trailer on the north end of the Idaho Falls yard, the point at which EIRR interchanges with UP's Montana sub.

From Wikipedia’s article on Eastern Idaho Railroad, shared under CC BY-SA 4.0.3

Subsidiaries and ownership

Parent company

From Wikidata.1

Timeline

  1. 1993Acquired Acquired by Watco Companies1

Sources

The numbers on this page point here. Each one links to the record it came from.

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