Final answer:
The voltage in a metro rail's power station room varies, with common traction power supplies ranging from 750 volts DC to 25,000 volts AC, depending on the metro system.
Step-by-step explanation:
The information about the specific voltage in the Department of Water and Power (DWP) power station room for a metro rail system can vary depending on the location, the metro system, and the design of the power infrastructure. Power stations typically generate and distribute high-voltage electricity, which is then stepped down through transformers for use in the metro rail system.
For accurate and up-to-date information on the voltage in the DWP power station room for a particular metro rail system, you should contact the relevant metro authority, power utility, or DWP directly. Electrical systems and standards can vary, and obtaining information from the appropriate local authorities or operators will provide the most accurate details for a specific location.