NEARLY 50 friends and fans of jazz trumpeter Dizzy Gillespie packed two refurbished American Zephyr traincars last weekend in Manhattan and enjoyed a rollicking four-hour party on the tracks to Washington.

WWRC-AM (980) jazz authority Felix Grant was aboard to capture the sights and sounds from such noted musicians as Carmen McRae, John Hendricks, Hank Jones and David Amaram. On Saturday at 4, Grant will talk about the ride and feature music by those musicians and more.

WWDC-AM (1260) has replaced "Naturally Nat" on Sundays at 1 p.m. with Eddie Gallaher hosting an hour of Broadway hits.

Here's what else is in the air: FRIDAY DENNIS OWENS SHOW AT 6 A.M. WGMS-AM/FM (570/103.5) -- Four hours of classical music and Owens' dry wit. DIANE REHM SHOW AT 10 A.M. WAMU-FM (88.5) -- Rehm's guest is Marcia Rosen, director of the New Horizons Center, who will discuss relationship addictions. MIDDAY MUSIC AT 10 A.M. WETA-FM (90.9) -- Featuring pieces by Wagner, Dvorak, Hadyn and Saint-Saens. SUBURBAN LIVING AT 11:15 A.M. WGTS-FM (91.9) -- Host John Wagner discusses concerns of suburban homeowners. 15 minutes. CROSSTALK AT NOON WDCU-FM (90.1) -- Ernest White hosts a two-hour talk show with special guests each weekday. Call 364-6090. COUNTRY OLDIES AT NOON WMZQ-AM (1390) -- Katy Daley spins classic country hits by request. Call 534-1390. PM DRIVE AT 1 P.M. WETA-FM (90.9) -- Robert Aubry Davis features works by CPE Bach, Schubert and Sibelius. MUSICA DE LAS AMERICAS AT 1 P.M. WPFW-FM (89.3) -- Von Martin hosts three hours of music and information from Latin America. SOCK HOP AT 8 P.M. WXTR-FM (104.1) -- Sherry Ellison spins sock-hop hits until 1. FIRST EDITION AT MIDNIGHT WAMU-FM (88.5) -- Aaron Hiter hosts seven hours of news and information. THE ROCKY ROAD SHOW AT MIDNIGHT WMET-AM (1150) -- Three hours of blues, country, rock 'n' roll and comedy hosted by a different local personality each weekend night. Airs again on Saturday at midnight.

SATURDAY ON THE MOVE AT 6 A.M. WHUR-FM (96.3) -- Tom Joyner, who hosts a morning show in Dallas and an afternoon drive show in Chicago, stops long enough to count down the nation's top 25 urban hits of the week. Three hours. WEEKEND EDITION AT 8 A.M. WAMU-FM (88.5) -- NPR's Scott Simon is host until 11 with news and features. At 11, a two-hour version of the show on WETA-FM (90.9). HENDERSON SHOW AT 10 A.M. WMZQ-AM (1390) -- Country oldies expert Gary Henderson plays five hours of classic country and hard-to-find recordings. THE BAMA HOUR AT 11 A.M. WPFW-FM (89.3) -- Jerry "The Bama" Washington hosts three hours of blues followed at 2 by three hours of oldies with Billy Ray Edwards on "The Way We Were." AFRICAN CONNECTION AT 11 A.M. WDCU-FM (90.1) -- Ibrahim Bah plays three hours of African and Caribbean music. MAC McGARRY AT NOON WWRC-AM (980) -- McGarry returns from Ireland to feature cuts from the Emmy winning "Les Miserables," and tunes by Jack Jones, The King Sisters, Ella Fitzgerald and Arthur Prysock until 4. CHICAGO LYRIC OPERA AT 2 P.M. WGMS-AM/FM (570/103.5) -- Wagner's "Parsifal." "SONIDO LATINO" AT 2 P.M. WDCU-FM (90.1) -- Noel Carvajal hosts two hours of Latin jazz and salsa music. JERRY GRAY SHOW AT 3 P.M. WAMU-FM (88.5) -- Country music, songs of the Old West and a touch of western swing until 6. A PRAIRIE HOME COMPANION AT 6 P.M. WETA-FM (90.9) -- The final live performance from the World Theater in St. Paul. Humorist Garrison Keillor delivers the last "News From Lake Wobegon." This week's guests are Chet Atkins, Jean Redpath, Rick Dworsky, Kate MacKenzie, Leo Kottke, Phillip Burnelle and the Kamehameha Glee Club on a program expected to run longer than the usual two hours and followed by a 90-minute program of clips from interviews with Keillor, music and stories about the 13-year-old program. "APHC" repeats Sunday at 1. "FAVORITE THINGS" AT 7 P.M. WDCU-FM (90.1) -- Jazz 90's Gerry Hanlon counts down the country's top 30 jazz albums of the week. Three hours. "SOLID GOLD" AT 7 P.M. WMJR-FM (107.7) -- Live from New York, Dick Bartley hosts a five-hour oldies request program. Call 800/634-5789. "SUPER GOLD" AT 7 P.M. WXTR-FM (104.1) -- Mike Harvey hosts a five-hour live request show from the West Coast. HOT JAZZ AT 7 P.M. WAMU-FM (88.5) -- Robert Bamberger presents three hours of vintage jazz. AFRICAN RHYTHMS AT 8 P.M. WPFW-FM (89.3) -- Kofi Dompere plays three hours of African and African-influenced jazz. BAMBOCH KREYOL AT 8 P.M. WPFW-FM (89.3) -- Emil Jules features Haitian music and information. JAZZ UNLIMITED AT 8 P.M. WGMS-AM/FM (570/103.5) -- Paul Anthony features Dave Brubeck and singer Annette Sanders until 11. THISTLE AND SHAMROCK AT 11 P.M. WAMU-FM (88.5) -- Host Fiona Richie features an hour of Scottish folk music. JIM BOHANNON SHOW AT 12:06 A.M. WTOP-AM (1500) -- Call-in talk show featuring interviews with entertainers and newsmakers hosted by Mutual Broadcasting's Jim Bohannon until 5 a.m. BLUEGRASS OVERNIGHT AT MIDNIGHT WAMU-FM (88.5) -- Six hours of bluegrass.

SUNDAY GOSPELTIME AT 5 A.M. WAMU-FM (88.5) -- Walter Kennedy features traditional gospel music followed at 6 by Red Shipley and "Stained Glass Bluegrass." G-STRINGS AT 7 A.M. WPFW-FM (89.3) -- Tom Cole with four hours of guitar music. AMERICAN TOP 40 AT 8 A.M. WRQX-FM (107.3) -- Casey Kasem counts down Billboard magazine's hits of the week. MUSIC AND MEMORIES AT 8:05 A.M. WMAL-AM (630) -- Bill Mayhugh features the hits of the '40s, '50s and '60s. RICK DEES AT 8 A.M. WAVA-FM (105.1) -- L.A.'s hot DJ counts down the nation's Top 40 hits. "ROCK, ROLL & REMEMBER" AT 8 A.M. WXTR-FM (104.1) -- Dick Clark features Bobby Darin and reviews the year 1975 until noon. "AWAKE, ALIVE & JEWISH" AT 8 A.M. WNTR-AM (1050) -- Rabbi Shmuel Kaplan and Michael Hoffman are hosts. One hour. PLAY IT AGAIN, ED AT 8 A.M. WWRC-AM (980) -- Ed Walker spins tunes from the '30s through '60s. "HOUR OF DECISION" AT 9 A.M. WFAX-AM (1220) -- Hosted by Billy Graham. MAX REZNICK AT 9 A.M. WNTR-AM (1050) -- Two hours of Jewish music, news and entertainment. LOST AND FOUND AT 9 A.M. WMJR-FM (107.7) -- Two hours of the "lost hits" of the '70s. JAZZ BRUNCH AT 9 A.M. WLTT-FM (94.7) -- Steve Allan spins three hours of contemporary light jazz favorites until 1. WEEKEND EDITION AT 9 A.M. WAMU-FM (88.5) -- NPR's Susan Stamberg hosts a two-hour news and information magazine that tracks the progress of arts and leisure projects. One hour of the program is repeated at 11 a.m. on WETA-FM (90.9). OVER THE GARDEN FENCE AT 10 A.M. WTOP-AM (1500) -- Jack Eden with insights for gardeners. Call 363-WTOP. MASTERPIECES AT 10:30 A.M. WGTS-FM (91.9) -- Ron Bardach hosts two hours of sacred and classical featuring Delius' "Mass of Life." DICK SPOTSWOOD SHOW AT 11 A.M. WAMU-FM (88.5) -- Traditional music with country roots, the blues and the music of America's minorities until 2. SOUNDS OF SINATRA AT 11 A.M. WWDC-AM (1260) -- Two-hour weekly syndicated program featuring music and conversation with Ol' Blue Eyes. COUNTRY COUNTDOWN AT 11 A.M. WMZQ-AM (1390) -- Bob Kingsley features the nation's Top 40 country tunes. ISRAEL TODAY AT 11:30 A.M. WMET-AM (1150) -- Michael Hoffman hosts 30 minutes of Israeli news, information and music. WOMEN HELPING WOMEN AT 11:45 A.M. WINX-AM (1600) -- Joan Dorf's guest Rose Kaplan discusses the importance of social security. JAZZ AT NOON WDJY-FM (100.3) -- Brute Bailey hosts three hours of mainstream and contemporary jazz. GARY OWENS SHOW AT NOON WINX-AM (1600) -- Three hours of music and interviews with stars of the '50s and '60s. WORLD OF THE PIANO AT 1 P.M. WGTS-FM (91.9) -- Paul Hume features Martha Argerich performing Ravel's "Sonatine" and Chopin preludes. TALKING PICTURES AT 1:36 P.M. WTOP-AM (1500) -- Sean Callahan discusses photography. IRELAND'S OWN AT 2 P.M. WNTR-AM (1050) -- Music, news and sports from Ireland with hosts Pat Troy and son Patrick. JAZZ SUNDAY AT 2 P.M. WAMU-FM (88.5) -- Rusty Hassan features pianists Jakki Byard and Mal Waldron. Four hours. CLASSICS OF EBONY AT 2 P.M. WGTS-FM (91.9) -- Nevilla Ottley presents an hour of music by black composers and performers. JAZZ CORNUCOPIA AT 2 P.M. WPFW-FM (89.3) -- John Zimbrick features three hours of mainstream jazz. SONGS FOR AGING CHILDREN AT 3 P.M. WETA-FM (90.9) -- Hosts Robert Aubry Davis and Martin Goldsmith feature music by Van Morrison. Two hours. THE LYONS DEN AT 3:56 P.M. WTOP-AM (1500) -- Jeffrey Lyons interviews prominent entertainers and takes a look at Hollywood. ECHO ATTILES AT 4 P.M. WHFS-FM (99.1) -- Balthasar hosts a two-hour Haitian show. SPIRIT OF INDIA AT 5 P.M. WMET-AM (1150) -- An hour of Indian news and music. ALL THINGS CONSIDERED AT 5 P.M. WETA-FM (90.9) -- An hour of news and information from National Public Radio. IN TRANSITION AT 6 P.M. WETA-FM (90.9) -- Robert Aubry Davis highlights Renaissance and medieval music in modern performances. BIG BROADCAST AT 7 P.M. WAMU-FM (88.5) -- Local radio historian John Hickman with seven radio programs from the '40s beginning with "To the Rear March!" followed by "Yours Truly Johnny Dollar" starring Bob Bailey; "Duffy's Tavern"; "Escape"; "Recollections"; "The Bell Telephone Hour"; and classic radio drama in "Cavalcade of America." THOSE OLDIES BUT GOODIES AT 7 P.M. WDCU-FM (90.1) -- Guy Tinner hosts three hours of old gold. THE POET & THE POEM AT 8 P.M. WPFW-FM (89.3) -- Grace Cavalieri's guest is Barbara Goldberg, author of "Berta Broadfoot and Pepin the Short." One hour. SOUNDS OF SURPRISE AT 9 P.M. WPFW-FM (89.3) -- Larry Appelbaum features Michael Brecker, Bob Dorough and Out of the Blue until 11. REGGAE SPLASHDOWN AT 9 P.M. WHFS-FM (99.1) -- Neci spins three hours of reggae music. "THE BLUES ROOM" AT 9 P.M. WCXR-FM (105.9) -- Frank Adair features two hours of blues. "THE JAZZ SHOW" AT 10 P.M. WMJS-FM (92.7) -- Jazz performer David Sanborn's NBC syndicated two-hour broadcast from Prince Frederick. PIANO JAZZ AT 11 P.M. WAMU-FM (88.5) -- Marian McPartland's guest is Dave Grusin. One hour. THE BEST OF LARRY KING AT 12:05 WTOP-AM (1500) -- A repeat of several King shows, until 5 a.m. JAZZ UNLIMITED AT MIDNIGHT WDCU-FM (90.1) -- Whitmore John hosts six hours of mainstream and bebop jazz.