There is a proposed rail connection with Colombia.

These were originally proposed to support navigation even in times of low water, but river-borne transport was already declining due to improved road and rail systems.

The proposed rail project, when completed, was the most intensive and ambitious of its kind ever undertaken to date.

The gauge of the rail would be to match the proposed construction and conversion of significant parts of the existing broad gauge system to standard gauge.

Research out of hypervelocity railgun technology was done to build an information base about rail guns so that SDI planners would know how to apply the technology to the proposed defense system.

Since the country's first rapid rail transit line opened in 1999 in Bangkok, daily ridership on Bangkok's various transit lines has risen to over 800, 000, with multiple additional lines either under construction or being proposed.

There are no rail links to China or Tajikistan, though a connection to the latter was proposed in 2008.

Young Scammon solicited subscriptions from the farmers and small businessmen whose land lay adjacent to the proposed rail.

However, it was discovered during test runs that the proposed motors and wheels would fail to provide adequate traction under some conditions, for example, when ice appeared on the rail.

* In 2010, rail and coach commuter service was proposed between Minturn and Dotsero, in 2012 from Leadville to Vail and Dotsero with intermediate stations at Minturn, Avon, Eagle and Gypsum.

Small sections of this track bed, and a nearby heavy rail track bed, have been proposed for reuse.

National railway company Vietnam Railways has proposed a high-speed rail link between Hanoi and Ho Chi Minh City, capable of running at speeds of.

* Gold Coast Rapid Transit, a proposed rail transportation system for Queensland, Australia

In 1970 and 1971, the Council of Economic Advisers in the Richard Nixon administration, along with the Antitrust Division of the Department of Justice and other agencies, proposed legislation to diminish price collusion and entry barriers in rail and truck transportation.

Waterloo station was to be the central London terminus for the proposed Heathrow Airtrack rail service.

* Scranton ( NJT station ), the proposed terminus for New Jersey Transit passenger rail service from New York City and Hoboken to Scranton, Pennsylvania

There is commuter rail service in the planning stages along the Norfolk Southern line, with proposed stations in Forest Park, Morrow, Jonesboro, and initially ending at Lovejoy.

The proposed Beccles rail loop is designed to allow trains to pass each other on a previously singled section of rail track ( between Lowestoft and Halesworth ).

Faster high-speed rail of, such as the proposed Beijing-Shanghai Express Railway in China (, or 5 hours ) and Tokyo-Sapporo Hokkaido Shinkansen in Japan (, or 4 hours ), may play a significant role in long-distance travel in the future.

The station is also designated a stop on the proposed California High Speed Rail System and the proposed Orangeline Maglev rail from Irvine.

Universal Paragon's proposed Brisbane Baylands project, if approved by Brisbane voters, proposes to more than double the existing employment base of the City by providing new office, research & development, retail, hotel and other land uses that are accessible by a proposed multi-modal transit station ( Caltrain, Muni T-Third light rail and proposed Bus Rapid Transit ).

* Dené – Caucasian superfamily: Based on the possible Caucasian link, some linguists, for example John Bengtson and Merritt Ruhlen, have proposed including Basque in the Dené – Caucasian superfamily of languages, but this proposed superfamily includes languages from North America and Eurasia, and its existence is highly controversial.

Another example has been proposed by Gerald Edelman called dynamic core hypothesis which puts emphasis on reentrant connections that reciprocally link areas of the brain in a massively parallel manner.

Mariners had noticed that lightning strikes had the ability to disturb a compass needle, but the link between lightning and electricity was not confirmed until Benjamin Franklin's proposed experiments in 1752.

Haeckel advanced a version of the earlier " recapitulation theory ", previously set out by Étienne Serres in the 1820s and supported by followers of Geoffroy including Robert Edmond Grant, which proposed a link between ontogeny ( development of form ) and phylogeny ( evolutionary descent ), summed up by Haeckel in the phrase " ontogeny recapitulates phylogeny ".

Pei proposed a central entrance, not unlike the lobby of the National Gallery East Building, which would link the three major buildings.

* Turkmenistan-same gauge ( former Soviet Union railway system ) ( No direct link, passing through Uzbekistan, but proposed railway will pass throgh Turkmenistan and link Kazakhstan to Iran )

Some researchers have proposed a link to languages like Tungusic and Turkic, which are often included alongside Mongolic in a group called Altaic languages, though this is controversial.

In 2008, a railway was proposed that would link Nouakchott with Tiguint, Mederdra, R ' Kiz, Leguatt, Leeleibatt, Menjem Boffal, Kaedi, and Bofal.

Over the years various theories of conversion and member retention have been proposed that link mind control to NRMs, and particularly those religious movements referred to as " cults " by their critics.

* Joint Gulf Railway proposed to link gulf states at cost of $ 14b by 2014.

The first formal formulation was proposed by Étienne Serres in 1824 – 26 as what became known as the " Meckel-Serres Law ", it attempted to provide a link between comparative embryology and a " pattern of unification " in the organic world.

Recent phylogenetic studies have lacked full confidence in this conclusion, however ; some studies link Perissodactyla with Ferae into a proposed clade Zooamata, while the Pegasoferae proposal goes further, suggesting Chiroptera ( bats ) are more closely related to odd-toed ungulates than even-toed ones.

The Manifesto proposed a socialist remedy for the economic crisis by establishing a link between industrial production, protection of the fundamental social benefits and the fight for an improved quality of life.

It is proposed to build or convert more standard gauge lines, including some dual gauging of broad gauge lines, especially where these lines link to adjacent countries.

Today scurvy is known to be caused by a nutritional deficiency, but until the isolation of vitamin C and its direct link to scurvy in 1932, numerous theories and treatments were proposed, often on little or no experimental data.

In 1570 a map by Ortelius showed the imagined link between the proposed continent of Antarctica and South America.

From the British Museum's reconstruction of the skull, Woodward proposed that Piltdown man represented an evolutionary missing link between apes and humans, since the combination of a human-like cranium with an ape-like jaw tended to support the notion then prevailing in England that human evolution began with the brain.

Inspired by Harry Harlow's famous experiments on rhesus monkeys, which established a link between neurotic behavior and isolation from a care-giving mother, Prescott further proposed that a key component to development comes from the somesthetic processes ( body touch ) and vestibular-cerebellar processes ( body movement ) induced by mother-child interactions, and that deprivation of this stimulation causes brain abnormalities.

But, in fact, the link was first proposed in print only in 1614, fifty-five years after the event and forty-eight after Nostradamus ' death ; thus it qualifies as a postdiction, or vaticinium ex eventu.

A long-standing debate to determine the nature of a proposed high capacity road, that would link the port of Heysham to the M6 motorway with the intention of reducing traffic congestion in the city centre, is one of the most prominent issues in local politics today.

As part of the People's Republic of China's National Expressway Plan, a tunnel or possibly a bridge, was proposed in 2005 to link the cities of Fuzhou, Fujian, China with Taipei, Taiwan across the strait （ Map ）.