[2] Pacific Electric Railway's Santa Ana substation #14 was built in 1907 and still stands.

It is a single-story, rectangular building made of brick with minimal classical ornamentation in its design.

Very high voltage alternating current (AC) from the Watts Steam Generating Station (30 miles [48 km] away) entered at one end of the building and was converted (by rectification by a six foot high massive rotating machine called a rotary converter) to 600 volts direct current (DC) necessary to power the interurban trains, and the DC wires then exited the building at the opposite end.

[3] Substation #14 was listed in the National Register of Historic Places in 1983 due to its association with the Pacific Electric Railways extensive operation in Orange County as well as for its architecture.

[3] The building was partially restored in 2020, replacing the roof and converting interior spaces.