यमला-पगला-ट्रेन का-दिवाना - कार्तिक

Its having 35 km per halt on an avg
1911 kms and 54 halts
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Has major stations which are busiest like patna, ddu, bsb, lko etc..
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Plus...
more...

single line section, famous kashi bridge where ddu to bsb take 1 hour minimum if train is lucky and has priority to get placed on platform..
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It has slow section like 100 mps in LKO-BE-MB section
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Speedup is not possible, hardly u can speedup an hour that too if all zones agree however it will not benefit a lot as well
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For speedup either remove few halts and wait for section to upgrade for higher speed..