Take a look at Phil Serpico's book Santa Fe Route to the Pacific to learn about the Santa Fe's Redondo District, Harbor District, the LA Ballona Division and Santa Monica Branch. [www.omnirr.com]

You might also like: Santa Fe's Coast Lines Depots, Los Angeles Division by Lee Gustafson and Phil Serpico. Also goes into the history of the Santa Fe lines to the harbors. [www.omnirr.com] This book also covers the Santa Fe's Redlands District, aka the Redlands Loop, along with the rest of the Los Angeles Division. This book is not just about depots, but about the Santa Fe's history in Southern California.

From the ERHA here is history of the narrow gauge Los Angeles & Redondo: [www.erha.org]

From the ERHA here is history of the Los Angeles Pacific: [www.erha.org]

Old Interurban Press publications on these two interurbans:

Los Angeles & Redondo by Ira Swett: [www.amazon.com]

Trolleys to the Surf: The Story of the Los Angeles Pacific Railroad by William Myers and Ira Swett: [www.amazon.com]

As for the Inland Empire here is some PE and predecessor info from ERHA:

[www.erha.org] and [www.erha.org]

Books:
Tractions of the Orange Empire by Ira Swett: [www.amazon.com]

Pacific Electric Northern and Eastern Districts by Ira Swett: [www.amazon.com]

If you do some searching the older used books can be had for better prices, or they can be viewed at various libraries public and railroad historical groups.

Glen Icanberry
Redlands, CA