Section 17 in The Delhi Metro Airport Express Line, General Rules, 2010
17. Provisions of Signals.
(1)Fixed signals shall be provided on running lines at the approach to all points and crossings of interlocked areas and located in such a way that trains will stop at a safe distance from any fouling movement or location.(2)All depot tracks and any other tracks not equipped with Automatic Train Protection shall be controlled by fixed signals for both entry and exit.(3)All single ended tracks shall be provided with at least one permanent red aspect light to indicate the point beyond which train shall not proceed.(4)Stopping markers shall be provided at all platforms to indicate where a train of a given length will stop for the convenient detraining and entraining of passengers, where trains of varying lengths may operate, separate markers will be provided for trains of each potential length.
