"And the 51 miles of electrification work will cost $2.3 billion, up from the previous estimate of $1.98 billion."
Old costs projections math = 1980 / 51 = $38.8 million/mile
New costs projections math = 2300 / 51 = $45 million/mile
Projected costs math = 2300 /1980 x 100 = 116% or up 16%.
On time and on budget construction projects just do not ever exist in California anymore.
Time is money, take longer to do it always costs more.