Bet you've never seen a turntable like this. Today, the B&O; Railroad Museum's program "Round and Round" allows visitors to watch as the Roundhouse turntable moves locomotives.

The turntable, a 50-foot rotating hardwood circle with train tracks in its center, is able to move a 100,000-pound locomotive 360 degrees. It only takes one person to control the 1884 turntable, which is the centerpiece of the Roundhouse.

Three locomotives - America's first steam locomotive, the Tom Thumb; America's first horizontal boiler steam locomotive, the Lafayette; and America's oldest operating steam locomotive, the William Mason - will be rotated and placed in their bays today.

The locomotives had undergone preparations for their appearances in the "Fair of the Iron Horse," which is scheduled to take place next summer.

The "Round and Round" event takes place from 1 p.m. to 3 p.m. at the B&O; Railroad Museum, 901 W. Pratt St. Included in regular admission: $8; $7 seniors; $5 ages 2-12; free for ages under 2. Call 410-752-2490.