The Metro in Mumbai currently runs a single line on the Ghatkopar-Versova corridor. Since we aspire to make the Metro meet international standards, maps have become a default at stations. It is a part of the station layout. The line in operation is depicted 'Red' on the maps and ‘Blue’ on their website and inside the train. Therefore, the colour for the line can be defined as 'Red' or ‘Blue’. Currently, it does seem like a problem, as only one line is operational, but what about the future?