question: What voltage was used in the two lines opened in 1925 of Southern Railway ?
answer: 6.7 kV 25 Hz
turker_answer: 6.7 kV 25 Hz was the voltage used in the two lines opened in 1925 Southern Railway .
rule-based: 6.7 kV 25 Hz was used in the two lines opened in 1925 of Southern Railway .