。
The train departs at 1:30 this afternoon.
Literal
Train [topic-は] today [of-の] afternoon 1:30 [at-に] departs.
A scheduling sentence with a compound time expression: 今日の午後１時半 ('today's afternoon 1:30'). Japanese chains temporal specifiers from broadest to narrowest, joined by の. に marks the specific time point, 発車 ('departure, setting off') is the formal noun-verb for trains/vehicles leaving.