Northern surprised their opponents through a 4th minute penalty corner strike by Harpreet Kaur.
Western retaliated through a fine field goal by captain Chanchan in the 14th minute but later failed to translate their superiority into goals and had to be content with sharing the points.
Hosts Central Railway scored a thumping 16-0 win over West-Central as Vandana Kataria (5), captain Saundarya (4) and Rashmi Singh (3) made merry. The other goals came through Pratibha Sawant, Usha Singh and Sushila Chanu and an own goal by West Central.
Vinita Xess (5) was the top scorer, while a goal each from Anima Minz, Poonam Barla and Lawrencia Karketta completed the winners' tally. The consolation goal for NCR was scored by Pooja Kundu.
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With this win, SER need to beat Northern in their last encounter whereas the latter just need a draw to enter the next stage.
The top two positions in Group B will be decided in the match between Central and Rail Coach Factory (Kapurthala).