The Eastern Idaho Railroad (EIRR), "The Snake River Route", has 268 miles of former Union Pacific trackage in southeastern Idaho. They began operation in 1993 under the management of Watco, Inc. (WAMX). Their primary tonnage is agricultural products.

EIRR 3504 at Twin Falls, ID, 8/06/02.  Note the unique
spark arrestor on the exhaust stack.

EIRR 3505 at Twin Falls, ID, 8/06/02.

EIRR 3006 at Twin Falls, ID, 8/06/02.

EIRR 3510 at Twin Falls, ID, 8/04/04.