Only seven units were built, all for use by Texas Utilities on two short industrial freight lines.
It was designed for operation on 25kV AC at 60 Hz at up to 70 miles per hour (110 km/h), though normal use was half that speed.
[1][4] The seven E25B locomotives built were all used by Texas Utilities on the Martin Lake Line (serving the Martin Lake Power Plant) and the Monticello Line (serving the Monticello Steam Electric Station).
[4] Electrification was activated on the Monticello Line on October 7, 1976, with service beginning the next day.
[1][2][3] The four locomotives at Martin Lake ran in shuttle service between a mine and the power plant; those at Monticello ran a shuttle service to a mine in Winfield and also interchanged with the mainline at Leesburg.