The train from Liverpool arrives at 7:30 правильно ??

Yes. For natural English you could say one of these:

• The train from Liverpool arrives at 7:30, right?
• The train from Liverpool arrives at 7:30, doesn't it?
• The train from Liverpool arrives at 7:30, is that right?

If you want a more formal version: The train from Liverpool arrives at 7:30, correct?

Would you like me to check a timetable or translate this into Russian?