There is exception in all the cases and with different trains first of all the main point is that route between New Delhi and Old Delhi to Delhi Sarai Rohilla is electrified. Even after Delhi Sarai Rohilla upto Patel Nagar is electrified.
Now coming on routes of trains the trains coming from back likE New Delhi, Delhi doesn't touch DEE but goes via Patel Nagar.
Delhi Sarai Rohilla station is meant for trains originating for Gujarat, Rajasthan and some exceptional trains like YPR Duronto.
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Old Delhi-Daya Basti- Delhi Kishanganj-Delhi Sarai Rohilla
New Delhi- Sadar Bazar- Delhi Kishanganj -Delhi Sarai Rohilla.
If something is wrong please correct