The Marriott Corp. called. They talked of taking it on tour.

Ringling Brothers Circus called too. They thought of adding it to their listings.

At least two restaurants chains called. They wouldn't mind it as a conversation piece.

One antique dealer volunteered to sell it off in pieces, promising a far higher return than the asking price. Several callers wanted chunks of it; one man just asked for the wheels.

And several historical societies asked - demanded, even - that it be made an outright gift to posterity. And, of course, Smithsonian will take it - as a donation.

"It" is the "Dover Harbor" - an 80-foot long, 55-year-old Pullman car that has adorned a weedy siding at the Silver Spring B&O Station for the last half dozen years. Now she is up for sale.

And that sale has generated much interest among those who track such oddities. Not a small amount of interest resulted from the asking price: $69,000 quite below the $265,000 the car was appraised at by Custom Car Services in Hagerstown, Md.

"We don't mind," said Robert Poole, secretary of Air Courier International of Silver Spring, which owns the car. "We didn't pay much more than the asking price for her three years ago. We just want to sell her for a small loss; no big tax hassles that way."

Air Courier, an air package delivery service, is a million dollar - plus corporation with offices nationwide. Three years ago it began with three employees, the Silver Spring office - and the "Dover Harbor."

"Our president, Lewis Levy, is a real antique buff," said Poole."He thought it'd be a great gimmick, a neat place to take clients to lunch.

"We'd hire a cook for the day, and he'd lay a spread. We'd come down with our clients - our offices are just up the street - and they'd really be impressed.

She got us some early sales, I guess." But all that was during the building stages for Air Courier. Now, Levy has moved the firm's headquarters to Phoenix. He wanted to take the car with him, but the nearest siding that a railroad was willing to let him sue is 65 miles away, Poole said.

So Poole ran an ad. And on Saturday, he'd stick a "For Sale" sign out on Georgia Avenue.

"It was amazing. People came by the dozens. Some would drive by, slow down, then return with whole families, just to take a tour," said Poole.

"Some even wanted to know if there was an admission charge."

The car was built by Pullman in 1922 as a library car, only one of nine such ever constructed. She featured a reading-lounge area, which occupied the rear half of the car, and six bedrooms forward.

In 1931, a galley was added. Air conditioning came three years later, along with a full conversion to a sleeper-lounge. In 1946, after 24 years service on the old Pennsylvania Railroad, she was sold to a private buyer. Another owner acquired her in the '50s and held her until Air Courier came along.

As such contraptions go, "Dover Harbor" is not that special to look at. She lacks the open platform elegance of many other private rail cars. But to rail buffs, she is a treasure. Only five of her sisters remain. And "Dover Harbor" is in excellent shape by standards of such things.

"Many visitors just wanted to buy parts of her," said Poole, citing first the caller who just wanted the wheels, then going to others who wanted such things as bunks, toilets, the single (and unusual even then) shower stall, and the kitchen and dining ware.

"We don't want to sell her in parts," said Poole. "We want everything to go as a unit."