The Metro Gold Line grew by 11.5 miles Saturday, extending through Arcadia, Irwindale, Monrovia, Duarte and Azusa, making it the transportation agency's longest rail line and pushing the overall rail system close to the 100-mile mark.
The Foothill extension of the Gold Line, which began service at noon, brings the route to 31 miles overall, connecting the San Gabriel Valley with downtown and East Los Angeles.
The $1 billion extension includes six new rail stations, providing access to locations such as City of Hope hospital, Azusa Pacific University, Citrus College and Santa Anita Racetrack.
Metro spokesman Dave Sotero said the opening of the line will push the overall Metro rail system to 98.5 miles. The system will cross the 100-mile mark on May 20, when the Expo Line is extended 6.6 miles from Culver City to Santa Monica.
Metro A map of the Metro Gold Line rail, connecting the San Gabriel Valley and East Los Angeles.
Metro is planning a celebratory atmosphere, with afternoon parties planned at the Duarte/City of Hope, Arcadia, Monrovia, Azusa Downtown and Irwindale stations. The events will include live music, food vendors and booths highlighting area businesses.
Free rides will be offered along the entire Gold Line route from noon to midnight to celebrate the opening of the extension. The free rides will be offered only on the Gold Line.
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Metro officials noted that shuttle buses are still being used between the Union Station and the Gold Line's Pico/Aliso station due to construction on the Regional Connector rail project in downtown Los Angeles.
Metro officials also reminded San Fernando Valley residents that they can take advantage of the new 501 Line express bus connection the Metro Red/Orange Line station in North Hollywood with the Gold Line's Del Mar and Memorial Park stations in Pasadena. The buses will run every 30 minutes, and cost $2.50 per trip.
The Gold Line extension is expected to carry 13,600 passengers per day by 2035.
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A look back at 2016 in photos.
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Clippers' superstar Chris Paul teamed up with comedian Kevin Hart Monday Dec. 19, 2016 to take 500 kids on a shopping spree for the holidays.
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Third graders in need were surprised with 100 bikes when they thought only four students were receiving them in Tustin, Monday, Dec. 12, 2016.
KNBC-TV
LASD hosted a holiday party for children in their 999 for Kids Program on Sunday, Dec. 4, 2016. The party featured a field of snow for kids to play in.
@JohnnyMartin via Twitter
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Anti-Trump protesters flood the 101 freeway as they protest the President-Elect Donald Trump in Los Angeles, California, on Nov. 10, 2016.
AP
A child plays while her mother waits to vote at a weekend early voting polling place at the North Hollywood branch library in Los Angeles Sunday, Oct. 30, 2016. Los Angeles County election officials say some voters waited more than two hours to cast a ballot amid strong interest in early voting. Mike Sanchez, a spokesman for the Los Angeles County Registrar-Recorder, said Sunday that people waited for more than two hours during peak times Saturday at weekend voting centers that opened in and Culver City, Calif. (AP Photo/Reed Saxon)
Palm Springs Police Department
Several Palm Springs police officers greet Vanessa Vega, 8, outside her home on Monday, Oct. 24, 2016.
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Los Angeles Dodgers broadcaster Vin Scully waves to the crowd alongside his wife Sandra Hunt before the Dodgers take on the Chicago Cubs in game five of the National League Division Series at Dodger Stadium on October 20, 2016 in Los Angeles, California. (Photo by Sean M. Haffey/Getty Images)
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Law enforcement officers form a line in their patrol vehicles in honor of slain Los Angeles County Sheriff's Sgt. Steve Owen, shot and killed during the search for a parolee in the high desert north of Los Angeles.
Bobbie
A San Bernardino County mom wanted to put a smile on people's faces after several creepy clown sightings across the country so her daughters dressed up in dinosaur costumes.
Pasadena Humane Society
A mysterious donor left $8,000 cash inside a donation box at the Pasadena Humane Society on Wednesday, Sept. 22, 2016.
Mel Melcon/ Los Angeles Times
A 10-ton spire was attached on the Wilshire Grand Tower, pictured here, on Saturday, Sept. 3, 2016, making it the tallest building west of the Mississippi River.
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The U.S. Postal Service dedicated a Limited Edition Forever Stamp to Jaime Escalante, the East Los Angeles high school math teacher immortalized in the 1988 film "Stand and Deliver," in a ceremony Wednesday, July 13, 2016.
Instagram user @TravisGafford
A monster crowd of "Pokemon Go" players gathered at Santa Monica Pier Monday, July 11, 2016. (Credit: Travis Gafford)
Photos Courtesy of Fontana Police Department
After a Chihuahua named Jack Sparrow was discovered to have methamphetamine in his system, Fontana police arrested his owner on suspicion of animal cruelty, authorities said Monday, July 11, 2016.
@4perf35
A brush fire erupted in the Santa Clarita area on Saturday, July 9, 2016.
@sh8dyone
Rappers The Game and Snoop Dogg gather at a peace protest in downtown Los Angeles on Friday, July 8, 2016.
Courtesy of the National Park Service
Researchers have been tracking one of the mothers of the mountain lion kittens since April 2014 and the other since April 2015. Both litters, discovered in June 2016, are suspected to have the same father, P-38, who was seen traveling and spending time with both adult female cats.
Altadena Station, Los Angeles County Sheriff's Department
A stranded 80-pound Labrador was rescued in Angeles National Forest on Thursday, July 7, 2016.
AP
Geoffrey Yoder, from left, Michael Watkins, Rick Nybakken, Richard Cook and Jan Chodas celebrate in Mission Control at NASA's Jet Propulsion Laboratory as the solar-powered Juno spacecraft goes into orbit around Jupiter on Monday, July 4, 2016, in Pasadena, Calif. (AP Photo/Ringo H.W. Chiu, Pool)
Mike Eliason/AP/Santa Barbara County Fire Department
Firefighters from the Lompoc City Fire Department take shelter behind their engine, June 16, 2016, as wind driven flames advance from the Sherpa Fire.
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Chemical and metal materials explode inside a Maywood warehouse on Tuesday, June 14, 2016.
AP
Branden Joyce holds a sign in support of the shooting victims in Orlando, during the gay pride parade in West Hollywood, Calif. on Sunday, June 12, 2016. A gunman opened fire inside a crowded gay nightclub early Sunday, before dying in a gunfight with SWAT officers, police said. (AP Photo/Richard Vogel)
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Shivali Bidaiah
A dramatic scene as ET-94 crosses the overpass on the 405 Freeway on Saturday, May 21, 2016.
Southern California News Group
A black bear was perched in a tree in Rancho Cucamonga, forcing a lockdown at two nearby schools, on Wednesday, May 18, 2016.
Reagan Foundation
Goats trot into action as part of a wildfire prevention program in May 2016 at the Ronald Reagan Presidential Library in Simi Valley.
Kate Lord
A number of dogs gave their best shot at riding the waves to earn a spot on the 2017 Lucy Pet Rose Parade Float at America's Family Pet Expo on April 22, 2016.
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A basketball court collapsed at Marquez High School in Huntington Park Tuesday April 12, 2016.
A pursuit driver performs donuts Thursday April 7, 2016 on Hollywood Boulevard.
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Fans lined up outside the former Tower Records building Friday April 1, 2016 after an announcement that rock band Guns N' Roses will be performing a gig at the famed Troubadour.
Courtesy Huntington Beach Police Department
A Huntington Beach police officer is drawing praise after a video of him playing hopscotch with a girl was posted to the agency's Facebook page on March 30, 2016.
Thomas Wells
A whale watcher in Dana Point was one of the few who were able to watch a live whale birth off the California coast on Saturday, March 19, 2016.
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A horse took a tumble down a trail and had to be hoisted via helicopter near Sylmar on Saturday, March 19, 2016.
KVEA
Eight foster youth were treated to a Quinceanera party, a coming-of-age birthday celebration, on Saturday, March 12, 2016.
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A hearse carrying the casket of former First Lady Nancy Reagan passes saluting firefighters Wednesday March 9, 2016.
Glendale Police Department
A roadside sign in Glendale hopes to deter potential burglars. Glendale police provided this photo on Monday, March 7, 2016.
Katie Meyers. UCLA Athletics
UCLA unveiled a monument in Jackie Robinson's honor in Westwood on Saturday, March 5, 2016.
U.S. Air Force Photo by Michael Peterson/Released
An unarmed Minuteman III intercontinental ballistic missile launches during an operational test at 11:34 p.m., Feb. 20, 2016, Vandenberg Air Force Base, Calif.
Courtesy DJ Becker
A pony dressed up like a unicorn for a child's birthday party broke loose and had to be located by CHP in Madera, Calif. Feb. 25, 2016.
Michael Rozman / Warner Bros.
Viral video stars Josh, left, and his schoolmate Daniel, appear on The Ellen DeGeneres Show for an interview set to air Wednesday, Feb. 24, 2016.
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Convenience store surveillance video captured the moment a pizza delivery driver won $1.2 million after buying three Set for Life scratchers tickets "on a whim." Instant millionaire Joseph Carillo, a 31-year-old single father, jumped for joy and celebrated with customers and the clerk
First In
A Delta IV rocket takes flight Wednesday Feb. 10, 2016 from Vandenberg Air Force Base near Santa Barbara.
Courtesy Eric Mollinedo
A homeless man was found trapped inside a newspaper box in Harvard Heights Mon. Feb. 9, 2016.
Santa Clarita Sheriffs Department
A man was caught in a storm drain after allegedly attempting to steal a car and feeling from deputies in Canyon Country on Saturday, Feb. 6, 2016.
KNBC-TV
Demolition work began Friday Feb. 5, 2016 on the Sixth Street bridge near downtown Los Angeles.
KNBC-TV
A tanker truck hauling about 8,500 gallons of fuel overturned on the 10 Freeway and struck a tree, causing gas to spill on the highway, on Thursday, Feb. 4, 2016.
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When an ax-carrying burglar tried to break into Joseph Milspaugh's home on Sunday morning, the 92-year-old World War II veteran wasn't having any of it, he said Feb. 1, 2016.
Gadi Schwartz
Crews were cleaning up after a tree that toppled onto the 134 Freeway near Pass Avenue in Burbank after a storm hit the Southland on Sunday, Jan. 31, 2016.
NBC7
A worker takes a walk on the Sixth Street bridge ahead of its scheduled demolition on Wednesday Jan. 27, 2016.
AP
Football fans hug after the announcement of the return of the Rams to Los Angeles on the site of the old Hollywood Park racetrack in Inglewood, Calif., Tuesday, Jan. 12, 2016. NFL owners voted Tuesday night, to allow the St. Louis Rams to move to a new stadium at the site just outside Los Angeles, and the San Diego Chargers will have an option to share the facility. The Rams, based in the LA area from 1946-94, will play in a temporary facility, probably the Los Angeles Coliseum, until the new stadium is ready for the 2019 season. (AP Photo/Damian Dovarganes)
NewsChopper4
A truck collided with a vehicle on the same roadway as two 2014 deadly crashes in Beverly Hills on Friday, Jan. 15, 2016.
KNBC-TV
A driver who struck a power pole and fire hydrant in Montebello was rescued from a pickup truck, which was flooded in a pool of electrified water, on Tuesday, Jan. 12, 2016.
RMG News
Two witnesses said they rescued four people from a fiery crash in Tarzana on Saturday, Jan. 9, 2016.
Marin Austin/KNBC
Hundreds of protesters and Porter Ranch residents rallied at Granada Hills Charter High School, calling for the permanent closure of a gas storage facility ahead of a hearing held by air quality regulators, on Saturday, Jan. 9, 2016.
Raul Barriga
A viewer sent NBC4 this image of a fire at a Denny's restaurant in La Habra Friday Jan. 8, 2016.
Matthew Glasser/KNBC-TV
Police say LAX's Terminal 1 was evacuated due to a bomb threat on Friday, Jan. 8, 2016.
KNBC-TV
A low-lying stretch of the 5 Freeway in Sun Valley was inundated by floodwaters on a day of torrential rain on Wednesday, Jan. 6, 2016.
Debris and mud flow from the Calgrove burn area led to the evacuation of residents from 10 mobile homes in a Stevenson Ranch park in Santa Clarita Wednesday, authorities said. (Published Jan. 6, 2016.)
Caltrans via Twitter
Three lanes were blocked on the westbound 134 Freeway right before the evening commute after a forklift fell off a big rig on Wednesday, Jan. 6, 2016.
FirstIn
A driver stalls in floodwaters Tuesday Jan. 6, 2015 near Lake Balboa in the San Fernando Valley.
KNBC-TV
The National Weather Service and police in Vernon were to investigate reports of a tornado Tuesday afternoon. (Published Jan. 5, 2016.)
Tracy Bowen
A mini-horse named Treasure reported stolen was found Sunday by Riverside police. (Published Jan. 3, 2016.)