| Subject | Spanish | English |
| transp. | banalización de las locomotoras | pooling of locomotives |
| transp. | banalización de las locomotoras | common user of locomotives |
| transp. | banco de pruebas para locomotoras | locomotive testing plant |
| mech.eng. | caldera de locomotora | locomotive boiler |
| transp. | cambiar de locomotora | to change locomotives |
| transp. | cambio de locomotora | change-over of locomotive |
| transp. | cambio de locomotora | change-over of tractive unit |
| transp. | carenado de la locomotora | streamlining of the engine |
| transp. | carenado de la locomotora | locomotive fairing |
| transp. | conducción de las locomotoras | driving of locomotives |
| transp., energ.ind. | conmutador de locomotora bicorriente | dual-system locomotive switch |
| transp. | conservación corriente de las locomotoras | routine maintenance of locomotives |
| transp. | conservación corriente de las locomotoras | running repair of locomotives |
| transp. | conservación corriente de las locomotoras | current maintenance of locomotives |
| transp. | desmontar las bielas de una locomotora | removal of locomotive rods |
| transp. | desmontar las bielas de una locomotora | to remove the locomotive rods |
| transp. | equipo de la locomotora | locomotive crew |
| nautic. | farol de locomotoras | floodlighting |
| commun., transp. | gestión integrada de un parque de locomotoras | integrated control of a locomotive stock |
| transp. | haz de espera de locomotora | engine storage |
| railw., sec.sys. | imán de locomotora | locomotive magnet |
| transp. | libreta de la locomotora | locomotive log |
| transp. | linterna de locomotora | locomotive head light |
| transp., el. | locomotora bicorriente de corriente continua 1500 V y corriente monofásica 50 períodos | tractive unit using 1500 V d.c.and 50 cycle single-phase current |
| transp., el. | locomotora bicorriente 1500/3000 V de corriente continua | tractive unit using two systems of direct current 1500 V-3000 V |
| transp. | locomotora con utilización directa de la energía eléctrica | locomotive fitted with direct-driven motors |
| transp. | locomotora con utilización directa de la energía eléctrica | direct-motor locomotive |
| transp. | locomotora de corriente alterna | single-phase locomotive |
| transp. | locomotora de corriente alterna | a.c.locomotive |
| transp. | locomotora de corriente continua | d.c.locomotive |
| transp. | locomotora de corriente monofásica | single-phase locomotive |
| transp. | locomotora de corriente monofásica | a.c.locomotive |
| el.tract. | locomotora de ejes acoplados | coupled-axle locomotive |
| el.tract. | locomotora de ejes independientes | individual axle drive locomotive |
| transp. | locomotora de empuje por o en cola | pusher locomotive |
| transp. | locomotora de empuje por o en cola | helper |
| transp. | locomotora de empuje por o en cola | booster locomotive |
| transp. | locomotora de empuje por o en cola | banking locomotive |
| transp., mech.eng. | locomotora de escape libre | non-condensing steam engine |
| transp., el. | locomotora de lomo de asno | shunting locomotive |
| el.tract. | locomotora de pequeña potencia | small-power locomotive |
| transp. | locomotora de refuerzo | assisting locomotive |
| transp., el. | locomotora de taller | works locomotive |
| transp. | locomotora de triple expansión | triple-expansion locomotive |
| transp., mech.eng. | locomotora de turbina de gas | gas turbine locomotive |
| mech.eng., el. | locomotora de turbina de gas y transmisión eléctrica | gas turbine locomotive with electric transmission |
| transp., construct. | locomotora de vía normal | standard gauge locomotive |
| transp., el. | locomotora para maniobras de clasificación | hump locomotive |
| transp., el. | locomotora para maniobras de clasificación | shunting locomotive |
| transp. | mantenimiento corriente de las locomotoras | running repair of locomotives |
| transp. | mantenimiento corriente de las locomotoras | routine maintenance of locomotives |
| transp. | mantenimiento corriente de las locomotoras | current maintenance of locomotives |
| transp. | pareja de la locomotora | locomotive crew |
| transp. | recorrido en doble tracción de una locomotora | assisting run of a locomotive |
| transp. | relevo de locomotora | change-over of tractive unit |
| commun., transp. | repetición de las señales en la locomotora | signal repetition on the locomotive |
| stat., transp., el. | repetidor de señales en la cabina de la locomotora | cab signal |
| transp. | revestimiento aerodinámico de la locomotora | locomotive fairing |
| transp. | revestimiento aerodinámico de la locomotora | streamlining of the lower parts of a vehicle |
| transp. | revestimiento aerodinámico de la locomotora | streamlining of the engine |
| transp. | rotación de las locomotoras | turn round of locomotives |
| med. | ruido de locomotora | to-and-fro murmur to-and-fro sound |
| med. | ruido de locomotora | seesaw murmur |
| transp. | señal de locomotora | locomotive head light |
| transp. | señal de locomotora | locomotive head lamp |
| commun., transp. | telemando de las locomotoras | remote control of locomotives |
| mech.eng. | tirante de locomotora | locomotive staybolt |
| transp. | vibración de los ejes de locomotoras | torque pulsation of locomotive wheel-sets |
| transp. | vibración de los ejes de locomotoras | stick-slip of locomotive wheel-sets |
| transp. | visita de la locomotora | summary inspection of the locomotive |
| transp. | visita periódica de las locomotoras eléctricas | periodical inspection of electric locomotives |
| transp. | volver a montar las bielas de una locomotora | to refit the locomotive rods |
