。
I missed the last train.
Literal
I [topic-は] last-train [for-に] missed-ride.
乗り遅れる ('to miss a ride, be too late to board') is a compound verb: 乗る ('ride') + 遅れる ('be late'). 終電車 (しゅうでんしゃ) is the last train of the day, commonly shortened to 終電 in casual speech.