<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Ferrocarriles</topic></authority><related type="narrower"><topic>Ferrocarriles de cremallera</topic></related><related type="narrower"><topic>Ferrocarriles eléctricos</topic></related><related type="narrower"><topic>Trenes</topic></related><related type="narrower"><topic>Monorraíles</topic></related><related type="other"><topic>Viaductos</topic></related><related type="other"><topic>Estaciones de ferrocarril</topic></related><related type="other"><topic>Transportes ferroviarios</topic></related><related type="other"><topic>Túneles</topic></related><related type="other"><topic>Correo por ferrocarril</topic></related><related type="other"><topic>Puentes</topic></related><related type="other"><topic>Pasos a nivel</topic></related><related type="other"><topic>Accidentes ferroviarios</topic></related><related type="broader"><topic>Ingeniería civil</topic></related><related type="broader"><topic>Red viaria</topic></related></mads>