Related Clues:

• Examination site where those with correct papers may pass
• Have a look at Malin Head - it might come as a blow if you're driving up there?
• Security measure has purpose after attack on board
• Charlie perhaps reported Eastern European issue
• Make sure that's not fake news coming from station on the border
• Control station and inspect part of railway
• Scrutinize the most important fact produced by Charlie in old Berlin
• Rumour of European objective for border crossing?
• Charlie's one part of frontier?
• Bar on train where travellers might be held up
• Charlie in Berlin, for instance