India, Feb. 18 -- New Delhi

The Delhi Metro Rail Corporation (DMRC) has floated a tender to procure 68 coaches for the Rithala-Narela-Nathupur (Kundli) corridor-an extension of the Red Line under Phase-4 expansion-officials aware of the matter said on Tuesday.

While the tender document stipulates a contract period, including maintenance for 15 years, officials said they initially plan to run four-coach trains on the extension.

"As per our initial plans, these cars shall form four coach trains. However, depending on passenger demand, there shall be the option of augmenting the number of coaches to eight. These cars will be of broad gauge since this corridor, an extension of the already operational Red Line, is being constructed in broad...