Mark Wallinger is proposing a 33-times life-size horse
A sculpture of a giant horse, a tower of stacked cubes and a steel "nest" are the final three designs that could grace a Kent hilltop.
The three proposals for a £2m landmark sculpture to mark the new Ebbsfleet International station were selected from a shortlist of five.
The designs from Mark Wallinger, Richard Deacon and Daniel Buren will now be "taken forward".
A decision on the winning proposals is expected to take place after January.
The Ebbsfleet Landmark Project commission has been dubbed the "angel of the south", in reference to Anthony Gormley's sculpture which overlooks the A1 motorway in Gateshead.
Mark Wallinger has proposed a white horse, 33 times life-size, which would look out over the Ebbsfleet Valley.
Richard Deacon's sculpture would see a "nest" of steel latticework outlining 26 interconnecting polyhedrons.
And French artist Daniel Buren has designed a "signal" tower of stacked cubes with a single laser beam of light passing through it.
Victoria Pomery, director of Turner Contemporary in Margate and chairman of the project's selection panel, said: "The panel was very excited by all the submissions and has decided to take three forward for further development before making a final decision.
"We have asked Mark, Daniel and Richard to refine their proposals and to explore the engineering and cost feasibility in more detail.
"Our aim is to meet again in January to review their work in the light of this information."
The Ebbsfleet landmark is intended to be an iconic symbol to represent the regeneration of north-west Kent, and the growth of London eastwards.
The chosen sculpture will be erected in Springhead Park, in the south-east corner of Ebbsfleet Valley, which was occupied by the Romans.
Stephen Jordan, chairman of the Ebbsfleet Landmark Project, added: "With such an outstanding range of proposals, it's right that we now look carefully at the practical delivery of each and explore further funding options.
"After all, this commission will not just be here for years but for generations to come.
"With over 40,000 people commenting on the proposals at the Bluewater exhibition, this has not only been a monumental consultation exercise but one that has proved extremely useful and constructive."
The sculpture has been commissioned by Eurostar, London & Continental Railways and Land Securities, the developers of Ebbsfleet Valley.