。
The train slid into the station.
Literal
Train [topic-は] station [into-に] slid-in.
すべりこむ is a compound verb: 滑る (slide) + 込む (enter, go deeply in). The suffix 込む adds the 'into' meaning to many action verbs — 飛び込む (jump in), 書き込む (write in), 詰め込む (cram in). A productive pattern worth learning.