1994 Eurotunnel miniature sheet of four 55p stamps, issued on 27 June, each one overprinted with the words “RAILWAY LETTER”.
An earlier version of this miniature sheet was issued on 6 May – the Channel Tunnel’s opening day – but Royal Mail apparently insisted that the “Railway Letter” wording be added, to avoid any scope for confusion.
U/M / Unmounted Mint / MNH / Mint Never Hinged.
Eurotunnel has operated railway shuttle services for vehicles through the Channel Tunnel since 1994, and issued railway letter labels between 1994 and 2001.
Further information is available at the Philatelic Compendium website.