A different alternative is to use electrical propulsion in tunnels.

There has been some work done on electrical propulsion.

Upon their return the committee recommended the adoption of electrical propulsion using the overhead current collection system.

It is an electrical propulsion system with Xenon gas fuel and microwave cathode.

For low thrust systems, typically electrical propulsion systems, this approximation is less accurate.

All had electrical propulsion equipment by General Electric.

Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills.

Emmet was a leading advocate of the electrical propulsion of ships from turbines.

"Start the engines," ordered the aged inventor, "and we'll try my new system of positive and negative electrical propulsion."

It was several days before the wrecked equipment was removed and the track and electrical propulsion system were returned to service.

In 1899 the city established its own tram company that expanded the routes of the Green trams after they transferred to electrical propulsion.

Somua-built trolleybuses used electrical propulsion equipment from Westinghouse.

With the acquisition of ADtranz, Bombardier gained competence in the electrical propulsion components business.

Trolleybus production began after the company partnered in 1978 with Toshiba, for the latter to supply the electrical propulsion systems for the vehicles.

In a nuclear electric rocket, nuclear thermal energy is changed into electrical energy that is used to power one of the electrical propulsion technologies.

During the initial development of railroad electrical propulsion, a number of drive systems were devised to couple the output of the traction motors to the wheels.

The same report stated that "[i]mprovements in battery technology will allow for increased power, increased electrical propulsion, and bigger gains in fuel economy."

Many submarines with diesel and electrical propulsion are mistakenly referred to as "diesel-electric" when they in fact have separately coupled diesel and electric engines.

But even for geostationary spacecraft using electrical propulsion for out-of-plane control with thruster burn periods extending over several hours around the nodes this approximation is fair.

The Mark 37 torpedo is a torpedo with electrical propulsion, developed for the US Navy after World War II.

Diesel engines are used for conventional propulsion; this class is the first boat in the Chinese inventory that can achieve full electrical propulsion, which greatly reduces radiation noise.

Years of research and development have produced the Variable Specific Impulse Magnetoplasma Rocket (VASIMR), an electrical propulsion device for use in space.

China was able to indigenously provide two types of propulsion systems, electrical and steam, but electrical propulsion could not provide the speed required, so the steam propulsion was selected.

The technology of electrical propulsion is not new, having been used in battleships before World War II and in the aircraft carriers Lexington and Saratoga in that war.

The type 920 electrical propulsion system and electronics of the passive acoustic homing torpedo had also been completed, while the basic technologies of compressed oxygen torpedoes were also mastered by the Chinese.