Fetching details from the dictionary...
to run into; to rush into
to (run and) seek refuge in; to take shelter in
雨宿りにカフェに駆け込んだ。
I rushed into a cafe to escape the rain.
電車に駆け込み乗車は危険だ。
Rushing onto the train is dangerous.
乗客が発車間際の電車に駆け込んでいる。
A passenger is rushing into the train just before departure.