Seventy years ago, on the eve of World War II, Sir Nicholas Winton - a British diplomat - helped hundreds of Czech children escape almost certain death at the hands of the Nazis.
Some of those whose lives he saved are embarking on a journey of remembrance across Europe - retracing their original route to safety on a special steam train.
Wednesday is the second leg of their journey and they are travelling from Nuremberg in Southern Germany to Cologne.
They will arrive in London later in the week.
Robert Hall reports.