Trains from the freight depot at Frethun, near Calais, were halted on Friday after more than 200 asylum seekers gained access to the yard.
French rail operator SNCF, which runs the depot, said on Tuesday the situation had not changed, with up to 50 would-be immigrants invading the site whenever a new train was about to depart.
A spokesman for rail freight company English Welsh & Scottish Railway (EWS), which has lost £6m because of the delays, said the situation was a "disaster for British business".
Robust security
SNCF had just 15 police officers patrolling the perimeter of the yard and five security staff, he added.
Since SNCF first restricted services heading to Britain in November more than 1,700 EWS international rail freight services have been cancelled.
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