N.Y.C. Admin. Code § 15-111.1: § 15-111.1 Credit for service in the uniformed transit police force or uniformed housing police force.

Any member of the uniformed force of the fire department, who immediately prior to his or her appointment or employment as such, has served or shall have served as a member of the uniformed transit police force or a member of the uniformed housing police force shall have the time served by such member in such force counted as service in the fire department in determining: (a) his or her eligibility to compete in a promotional examination; (b) his or her seniority credit for the purpose of grading a promotional examination; and (c) his or her seniority credit for the purpose of determining eligibility for transfers within the uniformed force of the fire department.