Matchanu-class submarines
... that when Bangkok's power plants were bombed during World War II, two Matchanu-class submarines were used as electric generators to keep city trams running?
... that when <a href="./Bangkok" id="mwCKY" rel="mw:WikiLink" title="Bangkok">Bangkok</a>'s power plants were <a href="./Bombing_of_Bangkok_in_World_War_II" id="mwCKc" rel="mw:WikiLink" title="Bombing of Bangkok in World War II">bombed during World War II</a>, two <b id="mwCKg"><a href="./Matchanu-class_submarine" id="mwCKk" rel="mw:WikiLink" title="Matchanu-class submarine"><i id="mwCKo">Matchanu</i>-class submarines</a></b> were used as electric generators to keep city trams running?