Context: 1,500 V DC is used in the Netherlands, Japan, Republic Of Indonesia, Hong Kong (parts), Republic of Ireland, Australia (parts), India (around the Mumbai area alone, has been converted to 25 kV AC like the rest of India), France (also using 25 kV 50 Hz AC), New Zealand (Wellington) and the United States (Chicago area on the Metra Electric district and the South Shore Line interurban line). In Slovakia, there are two narrow-gauge lines in the High Tatras (one a cog railway). In Portugal, it is used in the Cascais Line and in Denmark on the suburban S-train system.

Question: What is most common voltage for DC supply?
Answer: 1,500 V

Question: How many narrow-gauge lines in Slovakia?
Answer: two

Question: What railway line is DC being used in Portugal?
Answer: the Cascais Line

Question: Where in India line has been converted to AC?
Answer: Mumbai area

Question: In Romania, there are two narrow-gauge lines where?
Answer: Unanswerable

Question: There is a hog railway located where?
Answer: Unanswerable

Question: The Cascade Line is located where?
Answer: Unanswerable

Question: 1,500 V DC is used in what district in Connecticut?
Answer: Unanswerable

Question: The South Shore Line suburb line uses what?
Answer: Unanswerable