Sentence:  The new trains will also be fully <WSD>'walk-through</WSD>', with no carriage end-doors. Travelling on them is like riding on a sinuous, moving corridor. It's less claustrophobic than the old arrangement, but now you can no longer choose the carriage not occupied by the declaiming loony. 
Meaning of the word marked with <WSD> tags:  Of passenger carriages in a train, having no doors in gangway connections between the carriages, creating a "see-through" effect through the train.