If a proposed passenger train linking Yellowstone and Glacier national parks is to succeed, it must develop links with other forms of transportation, two of its backers say.

A tentative proposal calls for one train to run between Billings and Missoula and another from Billings to Great Falls. Bus service to take passengers from Great Falls to Glacier National Park and from Yellowstone National Park to a train stop in Bozeman would form the park-to-park link."If they do not interconnect, they will founder," travel consultant Bob Stevens of Bozeman said.

Stevens and Rep. Dorothy Bradley, D-Bozeman, were in Great Falls Wednesday to present the plan to the local Chamber of Commerce.

Bradley said the new train routes would not take riders away from existing bus routes.

"We believe it would enhance everybody's business, not take it away," she said.

Bradley and Stevens also met Wednesday afternoon with executives of D.A. Davidson & Co. to discuss possible financing for the project.