CINCINNATI (AP) _ An Amtrak passenger train was halted and its 175 passengers evacuated for several hours when a bomb report was phoned to an Amtrak office.

After authorities in Indiana searched the train for five hours Wednesday without finding a bomb, the passengers reboarded and the train continued on its way. The Cardinal, as the train is called, was en route from Chicago to Washington, D.C.

A man had called an Amtrak toll-free number and said he was had been on the train and overheard two passengers discussing a bomb aboard, said Cliff Black, an Amtrak spokesman in Washington.

Amtrak officials said they stopped the 14-car train at about 1 a.m. west of Rushville, Ind. School buses took passengers to the Rush County Courthouse in Rushville while the train was searched.

''I praise God,'' said Albertha Scott, 66, of Columbus, Ohio, who got off the train when it stopped Wednesday morning in Cincinnati. ''I haven't slept at all. I've been sitting up looking for Cincinnati, just wondering when we were going to get here.''