*From "The Electric Journal, Volume 12: A 100,000-Volt Portable Substation."

- 1914 -

For use along the Piedmont & Northern Electric Railway (and neighboring railways) by the Southern Power Company. This transformer car consists of 3 huge 1,000 KVA transformers and has mega bushing insulators that weigh 175 Ibs each totaling 950 Ibs in all. The transformers weigh 29,000 Ibs each! This car was designed by the SPCo to make spare capacity, temporary replacement, or emergency replacements for any of their substations. All of the SPCo's large hydroelectric plants, steam plants, cotton mills and substation were connected had rail sidings so this railway car was very useful! In this picture, the substation car is under 44,000 volts. This rolling substation can actually operate up to 100,000 volts!

http://books.google.com/books?id=JLLmAAAAMAAJ&pg=PA143&dq