Brits send tanks thru the Channel Tunnel...

via Sun

THE British Army has sent a TANK through the Channel Tunnel for the first time – to practise getting armoured vehicles to Eastern Europe quickly in case of a crisis with Russia.
The military exercise saw five armoured vehicles transported to France on train wagons in the early hours of Wednesday.
A Challenger tank and matching recovery vehicle, a Warrior armoured fighting vehicle, a Warrior recovery vehicle and a reconnaissance vehicle were all sent across the Channel during the exercise.
They made the 40-minute return journey a few hours later.

This is big in Europe but I don't quite get the excitement.  One raid by Russian Spetsnaz/GRU with a few demolition charges will destroy the tracks and shut down this form of rapid reinforcement.

More vehicles can be moved quickly by sea (if you're taking into account mass) and its not that far a trip.

As a PR exercise it sings.  Militarily practical?  Not so much.