The UK Government will not permit the possibility of passengers without entry rights to arrive on UK soil. This does not happen on any other mode either. Either UK Immigration officers are going to check prior to departure (as happens on Eurostar at Paris/Bruxelles/Lille etc and on Euroshuttle/ ships at Calais) or on lightly trafficked ferry routes, and all airlines, the responsibility is taken by the carriers and immigration checks carried out on arrival. If a carrier brings a passenger without entry rights to UK soil they get a substantial fine and financial responsibility to accommodate and return the passenger. Too many arriving passengers without entry rights will result in suspension of operating rights. Anyone boarding a plane to the UK in foreign parts will notice how meticulous the staff are in checking passports and entry permissions. There is a good financial reason for this!Well Finland and Russia manage on-train passport and immigration checks on the cross-border Allegro services...still not sure why this isn't possible between two EU countries? OK, I've had the answers that the UK is "special" and the UK has a huge immigration problem, but honestly how many illegal immigrants use Eurostar, or even how hard can one make it that such on-board checks are not possible?
t.
Ian
Checking passports on the train would mean having a stop before reaching the Channel to eject any passengers without entry rights. The French authorities would be none too pleased to have to cope with ejected passengers at Calais Frethun (or in some other place). Ejection would be confrontational and likely delay trains. The stop would also extend journey times.
You must also think about the cost of UK immigration staff and their French 'minders' riding about France checking passports. The size of the train and the possibility of confrontation with passengers without entry rights would probably mean a team of 5+ per train (plus paying for a SWAT team at Calais Frethun to deal with any problems). Each team might do a maximum of 2 trains per shift, unless more stops were added (in both directions) just to allow boarding and alighting of immigration staff, plus representatives of the French security services. This would be prohibitively expensive compared to one team of 5+ dealing with 7 or 8 trains per shift at Paris Nord, and slow down these EXPRESS services to be uncompetitive to air.
Not many illegal immigrants use Eurostar services because it is almost impossible to get on one without UK entry rights. It is all very well quoting the Finland-Russia through trains (of much smaller capacity), but Russia is not exactly the sort of place that many without correct papers tries to enter or leave. It is certainly not on an economic migrant route from third party countries. If it were, these old fashioned on board checks whilst the train is moving would soon stop.
Is this hard enough for you?