http://AATesaurus.cultura.gencat.cat/aat/getty_enhttp://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446locomotives by method of propulsion http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 locomotives BT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 electric locomotives NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 steam locomotives NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 gas-turbine locomotives NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 diesel-hydraulic locomotives NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31449446 diesel-electric locomotives NT