San
Diego and Imperial Valley Railroad - (en)
The San Diego and Imperial Valley Railroad (AAR reporting marks SDIY)
is a shortline operator on the San Diego and Arizona Eastern Railway
track in the United States (the Carrizo Gorge Railway (CZRY) is the
SD&AE's operator in Mexico and the Imperial Valley). The SD&IV
has been owned and operated by RailAmerica since 2000; it had been
previously owned by RailTex (which RailAmerica acquired) and operated
with the reporting mark SDIV.

The SDIY operated at one time on two lines but today operates on only
one. At one time it operated from San Diego to Plaster City via Mexico
but today that line is operated by the Carrizo Gorge Railway. The SDIV
still operates the San Diego to El Cajon line.

The SDIY has four locomotives although it often utilizes additional
locomotives from other RailAmerica shortlines. The railroad
interchanges with the BNSF Railway in San Diego.