Yes, every piece of luggage on the Eurostar undergoes a rigorous security screening process similar to that of an airport. Before you are permitted to board the train at stations like London St Pancras, Paris Gare du Nord, or Brussels-Midi, you must pass through a security checkpoint where your bags are scanned by X-ray machines and you must walk through a metal detector. However, unlike air travel, the liquid restrictions are far more relaxed; you are generally allowed to carry liquids, including beverages and toiletries, without the 100ml limit, provided they are not dangerous or prohibited items. Prohibited items include weapons, explosives, and certain flammable substances. It is important to arrive at least 60 to 90 minutes before your departure to account for these security checks and passport control. The process is designed to be efficient but thorough, ensuring the safety of all passengers across the high-speed rail network.