Dave Morrison strides through the old Oyster Bay railroad station dodging workmen’s saws and hammers, surveying progress of restoration plans for the century-old structure that will become a museum. Its timeworn walls and 25-foot cathedral ceiling are revealed for the first time in years.

“This is real history here!” Morrison says with enthusiasm. “This is going to be restored to its original beauty, the way it was when Teddy Roosevelt was here.”

Originally built in 1889, the station was upgraded in 1902, a year after Theodore Roosevelt became president. He and his staff, cabinet members and visiting dignitaries, traveled by rail between Washington and his home at nearby Sagamore Hill. While it might be hard to discern the station’s charm amid the sawdust, Morrison’s fervor for the work being done is contagious — not only for the $1.4-million restoration but for all things that involve railroad history.

Morrison, who is 71 and lives in Plainview, is an expert on the 182-year-old Long Island Rail Road and is helping to spearhead restoration efforts at the old Oyster Bay station. The LIRR is the oldest railroad line in America still operating under its original name, he says. An LIRR employee for 25 years, and since retirement in 1999, a collector, author, speaker, oft-quoted authority and historic preservationist, Morrison has been working on that railroad in one form or another for most of his adult life.

Longtime friend, fellow enthusiast and former LIRR colleague Bob Myers, 70, of Greenlawn, says, “Where do you go for Long Island Rail Road history? The answer is Dave Morrison.”

John Specce, president of the Oyster Bay Railroad Museum, the organization behind the station restoration, says, “If there was a degree in railroads, he would be a Ph.D. and a professor emeritus.”

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Although not an academically trained historian, Morrison has made a second career for himself while retired, researching and writing about the past. He has chronicled local railroad history in five books. The latest, a photographic history titled “Sunnyside Yard and Hell Gate Bridge,” was published Dec. 12. The Queens facility opened in 1910 and is still the world’s largest railroad passenger car storage yard. Morrison has more than 2,000 books on trains in his library and several thousand LIRR artifacts — photos, postcards, maps, timetables, annual reports amassed over the years. He is widely quoted on New York railroad history and has been featured on PBS’ “History Detectives” and on the Discovery Channel.

One of his proudest achievements is helping to rediscover and document the large marble eagles that once stood over the original Penn Station. The sculptures went missing during the controversial demolition of that landmark in the 1960s. Restoring the eagles was a major project. Morrison’s role was to research and document the location of the 22 original sculptures. The head of one of those recovered is now on loan at the “preview” center of the Oyster Bay Railroad Museum Station restoration; another stands on a pedestal outside the Hicksville Railroad station. There are two at the Merchant Marine Academy in Kings Point; two are outside Penn Station, on either side of the Madison Square Garden marquee.

He has done all of his research since retiring. “I’ve been retired for 17 years, and haven’t had a boring day yet,” he says.

Morrison’s great-great-great-grandfather, Charles Sexton, worked on the Camden and Amboy Railroad in the mid-19th century as a “coach trimmer,” installing interior fixtures in the cars. “Railroading is in my blood,” Morrison says.

His infatuation with trains began early in life. He was born in Yonkers, and his family had a summer bungalow in Croton on a hill overlooking a New York Central Railroad facility on the Harmon line. “I have a vague recollection of seeing some of what would have been the last steam engines in operation on the New York Central,” Morrison says. After graduating high school in 1963, he joined the Army. “I spent 2 1⁄2 years in Panama,” he says. “I was in a jungle, but fortunately, a more peaceful one than Vietnam.”

He got a job working for the oil company Esso as a lab technician at its Linden, New Jersey-based research division after leaving the service. He also pursued a Bachelor’s degree in labor relations, attending Rutgers University’s Newark campus at night. When he graduated, he was hired by the LIRR as a labor relations specialist. “I got the job when the railroad was really in the doldrums,” he recalls. “We would get radio reports every day about trains being canceled. That’s when the shop craft unions were creating havoc. It was not a good time for the railroad.”

Morrison and his wife, Diane, who is 65, moved to Hicksville in 1973 when he got the job. They have lived in Plainview since 1981 and have four children and two grandchildren.

After 14 years in labor relations, Morrison became a branch line manager overseeing the Oyster Bay, Port Jefferson and Montauk branches. “My passion was working with the customers at the railroad stations and the community leaders,” he says. During his decadelong stint as a branch-line manager, he also began to learn more about the LIRR’s 124 passenger stations — some of which date back more than a century.

“With the things he’s collected and shared and written, Dave’s had a huge impact,” says his friend Myers, who is vice president of Long Island’s Sunrise Chapter of the National Railway Historical Society. “Shared is the key word. He is very generous with his time and his information.” Myers says Morrison is also an activist in preserving the railroad’s history. “Dave shows up at functions. He spearheads things.”

Morrison receives praise as co-chairman of the Oyster Bay station restoration committee. “Dave brings a wealth of knowledge and good common sense to the committee,” says Specce, who is hoping for the new museum to open in 2018.

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Inspecting the exterior of the station, Morrison admires the craftsmanship on the original facade. “Look at the beautiful roof bracket,” he says. “And those leaded glass windows! They’re original. And the shells. The station used crushed shells from Oyster Bay as part of the decorative exterior.”

He stops to offer one of his many tidbits about the station: “The architect was Bradford Lee Gilbert,” he says. “He was also the architect for the 1898 Grand Central Station renovation.”

Carefully studying the south-facing exterior of the station, Morrison says, “It’s going to be beautiful when it’s done!”