Railways had their noses ahead with a 130-run lead in their second dig.
India Under-19 claimed the title beating Sri Lanka Under-19 in the final and Tyagi was the Man-of-the-Match returning figures of 6/38 with his left-arm spin in India 114-run win.
Chasing 305 in the final was never going to be an easy task and the Sri Lankan batsmen buckled under pressure.
Jaiswal scored 13 boundaries and one hit over the fence during his 93-ball knock.
Ayush Badoni and Harsh Tyagi shared six wickets after a collective batting show by the visitors as India Under-19 team mauled Sri Lanka U-19 by 135 runs.