KFVP's operating wavelength of 275 meters corresponds to 1090 kilohertz.
 
Evening Omaha (Nebraska) World-Herald, May 7, 1925, page 1:

TRADE  TRAIN  TO  TAKE  BROADCASTING  OUTFIT
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Desdunes  Band  to  Send  Out  Programs;  Local  Talent  Also  Will  be  Used.
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    Omaha will send forth one of the few portable broadcasting stations of the country with the trade tourists who start Sunday night.
    The radio station is being installed by the McGraw company in a Chicago & Northwestern car parked in the yards at Council Bluffs. The government has assigned the call letters KFVP and the station will be operated on a wavelength 275 meters by Harold Hosford, operator of the Grain Exchange station.
    Montagu Tancock, publicity director of the Chamber of Commerce will be announcer and director of programs. He says music will be broadcast along the route by Dan Desdunes band and that talent in the various towns also will be featured on the nightly programs. "Then of course leading citizens of the towns will broadcast," he said. "We also will give out our schedule a day in advance and will broadcast to the next town when we plan to arrive."
    The station will be rated at 1 hundred watts and will have a night sending range of about a hundred miles. The daylight range will be limited to probably twenty-five or fifty miles.
Omaha World-Herald May 11, 1925, page 1:

ENTHUSIASM  GOES  ALONG  ON  ANNUAL  TRADE  EXCURSION
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Tour  to  Northwest  Makes  Happy  Start  After  Desdunes'  Band  Serenades.
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FRIENDS,  RELATIVES  CROWD  THE  PLATFORM
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    A wave of the lantern in the hands of Conductor William S. "Dad" Babcock, a toot toot, a shrill cry from the siren, and the twenty-seventh annual trade tour of the Omaha Chamber of Commerce was off for the west at 7:30 last night. Families of the excursionists crowded the platform at Union station and lingered there with hoisted handkerchiefs until the last car of the long train was swallowed in the dusk.
    Adieus were properly bid beforehand while Dan Desdunes' band serenaded. Desdunes' band has accompanied the good will tour for the last fifteen years.
    The first stop is scheduled for 7 o'clock this morning and will be at Cody, Neb., 350 miles from Omaha, where the Omahans will begin their task of cementing friendship with the merchants and people of that section. Following this fifteen towns will be visited ending with Hot Springs, S. D., and then an overnight run to Belle Fourche to start the second day.
Warned  by  Radio
    Each town will be warned by radio of the approaching visit. The train is equipped with a broadcasting station of 125-mile radius. Mantagu Tancock will "announce" and every time the train stops for any length of time in the evening a musical program will be sent out.
    Officials were enthusiastic at the start.
    "It has been more than ten years since we have visited the towns included on this trip," said E. H. Hoel, chairman of the trade extension committee of the Chamber of Commerce. "While we realize there has been an increase of trade in that section of the country we want to get in on it."
    T. C. Byrne, president of Byrne & Hammer Dry Goods Co., said the territory along the main line of the Chicago & Northwestern railroad, which is to be visited, includes many of Omaha's best customers and that the section to be visited in the Black Hills has been doing a large volume of business for many years.
Many  Souvenirs
    "The large representation of Omaha business men shows the enthusiasm with which the commerce of Omaha looks upon the territory to be visited," declared Clark Powell, commissioner of the Chamber of Commerce. Mr. Powell is not making the tour himself.
    "The spirit evidenced by those making the trip this year spells a fine business lookout for 1925," said W. A. Ellis, assistant commissioner of the chamber.
    M. A. Tancock, manager of the Omaha Chamber of Commerce publicity bureau, said many responses to advance notices had been received from the towns to be visited. "They indicate the existence of a very friendly relationship for Omaha," he asserted.
    John Changstrom is in charge of parades on the trip and A. D. Speir will superintend the disposal of a carload of special souvenirs. Car captains are Earl Nesbit, C. L. Owen, J. A. Moran, Perry Hendricks, Harold Marsh and George L. Howell.
Evening Omaha World-Herald, May 11, 1925, page 2:

CATTLE  COUNTRY  GREETS  OMAHA  GOOD  WILL  TRAIN
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Green  Grazing  Lands  Greet  Eyes  of  Travelers  on  Excursion;  First  Stop  Made  at  Cody.
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Special Dispatch to the World-Herald.
    Merriman, Neb., May 11.--Omaha Good Will delegates were up bright and early today greeting old time friends and customers in the Sand Hills country and the night run from Omaha to Cody was uneventful. At Cody, Cherry county, the first official visit was made. A good crowd was on hand despite the early hour. Today, the special is traveling through the Nebraska cattle country. Good sized houses are to be seen all along the line and the grazing lands are exceptionally green for this time of the year. Not all the optimism is with the Good Will delegation. Broad smiles on the faces of those who came down to the train at Cody, Eli and Merriman told the story of how the folks in this country are feeling.
    KFVP, the radio broadcasting station, aboard the special, will take the air for first program tonight at 8 o'clock, mountain time, after the train reaches Hot Springs, S. D. The station cannot broadcast while the train is moving for lack of power. At Hot Springs, the town current will be tapped. The station will operate on a wave length of 275 meters. Montagu Tancock, Chamber of Commerce publicity director, who will be announcer will ask Omahans who may hear the station tonight to let him know by telegraph.
Omaha World-Herald, May 12, 1925, page 2:

CHADRON  MEETS  OMAHA  CARAVAN  WITH  'ARREST'
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Good  Will  Tourists  "Sentenced"  to  Boost  for  Blue  Pole  Highway.
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NIGHT  AT  HOT  SPRINGS
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Special Dispatch to the World-Herald From a Staff Correspondent.
    Hot Springs, S. D., May 11.--Omaha's Good Will caravan is in South Dakota tonight after paying visits to sixteen towns along the North Western railroad west from Cody, Neb.
Broadcast  at  Hot  Springs.
    The Omaha delegates were up bright and early today greeting old time friends and customers in the Sand Hills country after the night run from Omaha to Cody was uneventful.
    At Cody, Cherry county, the first official visit was made. A good crowd was on hand despite the early hour. KFVP, the radio broadcasting station aboard the special took the air for the first program tonight at 8 o'clock, mountain time, after the train reached here. The station cannot broadcast while the train is moving for lack of power. At Hot Springs, the town current was tapped. The station will be operated on a wave length of 275 meters. Montague Tancock, Chamber of Commerce publicity director, was announcer.
Omaha World-Herald, May 13, 1925, page 2:

GOOD  WILL  TOURISTS  SEE  THE  BLACK  HILLS
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And  Find  Country  Badly  in  Need  of  Rain--Visit  Gold  Mine  Towns.
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ARE  IN  NEBRASKA  TODAY
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Special Dispatch to the World-Herald From a Staff Correspondent.
    Rapid City, S. D., May 12.--Omaha's trade boosters en route from Belle Fourche to Rapid City today through the Black Hills saw a country badly in need of rain.
    The Rapid City Chamber of Commerce took charge of the entertainment of the visitors tonight. They gave a dance and assisted in the nightly radio program from the special's broadcasting station, KFVP. Local talent assisted Dan Desdunes band with the musical part at the bill. Dr. C. C. O'Harra, president of the South Dakota State School of Mines, spoke about the Black Hills and Secretary John Green of the Chamber of Commerce welcomed the trade boosters. Bruce Cunningham, representing the Pioneer Paint and Glass company, Montague Tancock and the World-Herald's representative, also made radio addresses. Last night the station was heard 1 hundred miles away from Hot Springs.
Omaha World-Herald, May 16, 1925, page 4:

CALL  TRADE  TRIPPERS  RAINMAKERS  IN  NORTH
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From  Nenzil  to  Neligh  Omahans  See  a  "Million  Dollar  Downpour."
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RETURN  HOME  TONIGHT
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(Special Dispatch to the World-Herald from a Staff Correspondent.)
    Neligh, Neb., May 15.--The Omaha trade trippers were greeted as "the rainmakers" in sixteen towns in north central Nebraska today between Nenzil and Neligh.
 
Trade  Trip  Notes

    M. M. Welton, representing the McGraw Electric Co., is called upon to answer many questions at every stop regarding the radio broadcasting station which his company installed on the trade special. A great deal of interest has been shown in the wave length, power and range of the station, KFVP, which is being announced as "America's only broadcasting station on a passenger train." Harold Hosford, operator of the Omaha Grain Exchange station, WAAW, is the KFVP operator.