A would-be chain thief slashed a female straphanger with a razor during the Tuesday evening rush in the Bronx – about a week after a pink coat-wearing attacker choked a teen girl on board a Brooklyn train, cops said.

The victim was riding a northbound 2 train passing through the Pelham Parkway station around 5:30 p.m. when the perp – a stranger – inserted herself in a conversation the victim was having and sparked a fight, authorities and sources said.

The perp then cut the victim with a razor and tried but failed to grab her chain, authorities said.

The suspect, believed to be in her 30s, fled after the attack, police said.

In a separate, unrelated attack last week, a female stranger choked a 13-year-old girl during a clash on board a Brooklyn train during the morning rush, cops said.

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