The traveller got 12304/Poorva Express (via Patna). And reached Mughal Sarai at 8:30 (late by 3:30 hours). It was late by 2:30 at ald, late by 3 hours chunar junction.
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The next train for Gaya was Mahabodhi Express. So traveller got into it. It left Mughal Sarai at 9am and reached Gaya at 1:30.