@admin, please do impose a new color for closed railway lines instead of marking those lines as existing MG/NG lines. Those are creating a huge confusion.
For example, in Southern Railway Zone, Mayladuthurai Tranquebar MG line, Agasthiyampalli Point Calimere line are closed for traffic and there are no proposal to reconstruct these as of now (but future is uncertain). So this line can be marked with a new color inorder to avoid confusion with the operational Nilagiri Mountain Railway MG line in same SR zone. (Applicable for all zones)
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Now-a-days, there is a new tourism comming for those MG/NG railway lines as they are fading away from India. So please do consider this as a request and make a change.