; and (B) more than 15 MGT annually, at least twice per calendar year with not less than 120 days between TGMS inspections. (4) For track Class 3— (A) less than 15 MGT annually, at least twice per calendar year with not less than 120 days between TGMS inspections; and (B) more than 15 MGT annually, at least 3 times per calendar year with not less than 90 days between TGMS inspections. (5) For track Class 4— (A) less than 15 MGT annually, at least 3 times per calendar year with not less than 90 days between TGMS inspections