MINISTRY OF DEVELOPMENT
http://www.mfom.es

MINISTRY OF DEVELOPMENT. RAILWAYS
http://www.mfom.es/ferrocarriles/top_ferro.html

SEOPAN (National Association of Spanish Construction Companies)
http://www.seopan.es

GIF - Gestor de Infraestructuras Ferroviarias
http://www.gif.es

RENFE
http://www.renfe.es

ASOCIACIÓN NACIONAL DE FABRICANTES DE ÁRIDOS (NATIONAL ASSOCIATION OF MANUFACTURERS OF AGGREGATES) (ANEFA)
http://ww.aridos.org

COMMUNITY OF MADRID, MINISTRY OF PUBLIC WORKS, URBAN PLANNING AND TRANSPORT
http://www.comadrid.es/cmadrid/obraspub.htm

CONSORCIO REGIONAL DE TRANSPORTES DE MADRID (REGIONAL CONSORTIUM OF TRANSPORTS OF MADRID)
http://www.ctm-madrid.es

GENERALITAT DE CATALUNYA
http://www.gencat.es

GENERALITAT VALENCIANA, MINISTRY OF PUBLIC WORKS, URBAN PLANNING AND TRANSPORT
http://www.cop.gva.es/Welcome.htm

THE BASQUE GOVERNMENT
http://www.euskadi.net

GOVERNMENT OF THE BALEARIC ISLANDS, MINISTRY OF PUBLIC WORKS, HOUSING AND TRANSPORT
http://www.caib.es/sac1.htm

FGC (Ferrocarrils de la Generalitat de Catalunya)
http://www.fgc.catalunya.net

FGV (Ferrocarrils de la Generalitat Valenciana)
http://www.cop.gva.es/fgv

EUSKOTREN
http://www.jet.es/euskotren

FEVE (Narrow Gauge Railways)
http://www.feve.es

METRO DE MADRID
http://www.metromadrid.es

METRO DE MADRID, EXTENSION
http://www.comadrid.es/cmadrid/metro/index.htm

TMB (Transports Metropolitans de Barcelona)
http://www.tmb.net

METRO DE BILBAO
http://www.metrobilbao.net

FUNDACIÓN DE LOS FERROCARRILES ESPAÑOLES (SPANISH RAILWAYS FOUNDATION)
http://www.ffe.es

VÍA LIBRE Magazine
http://www.ffe.es/frames22.htm

RAILWAY GAZETTE INTERNATIONAL
http://www.railwaygazette.com/

ERRI (European Rail Research Institute)
http://www.erri.nl

UIC (Union Internationale des Chemins de Fer)
http://www.uic.asso.fr

AENOR
http://www.aenor.es

MINISTRY OF THE ENVIRONMENT
http://www.mam.es

GENERALITAT DE CATALUNYA. ENVIRONMENT
http://www.gencat.es/mediamb

EUROPEAN ENVIRONMENTAL AGENCY
http://www.eea.eu.int

ICAEN. Catalan Energy Institute
http://www.icaen.es

IDAE. Institute for the Diversification and Saving of Energy
http://www.qsystems.es/idea

CIEMAT. Research Centre for Energy, Environment and Technology
http://www.ciemat.es

ENVIRONMENTAL PROTECTION AGENCY
http://www.epa.gov

ENVIRONMENT AGENDA
http://www.gencat.es/mediamb/oia/ag_curs.htm