Model railroads crisscross Western Pennsylvania, and most have extended viewing hours for the holidays.

Here are five area displays miniature railroad enthusiasts may want to check out.

The Miniature Railroad and Village has reopened for the season at the Carnegie Science Center, next to Heinz Field on the North Side of Pittsburgh. The display is celebrating its 50th year in Pittsburgh.Tiny, speeding locomotives travel Western Pennsylvania's landscape, winding through 2,000 miniature replicas and 100 animated characters and scenes.Debuting this holiday season are replicas of the original Heinz Factory (house) in transport by barge along the Allegheny River; the Ebeneezer Baptist Church; an early glass factory and a stargazing animation.Also this season, the display will duplicate whistle stops during three of Teddy Roosevelt's presidential campaign stops in Pittsburgh. A miniature Roosevelt can be seen on the back of a decorated passenger train.The science center is open from 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays.Admission to the entire science center is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 18. Parking is free. Call 412-237-3400.

Western Pennsylvania Model Railroad Museum at the intersection of Route 910 and Hardt Road, Gibsonia, has its 17th annual display open through Jan. 16.The main attraction is a 40-foot by 100-foot scale model of train tracks between Pittsburgh and Cumberland, Md. Also available are children's displays, a gift shop and snack bar.Holiday hours are 6 to 9 p.m. Fridays and 11 a.m. to 5 p.m. Saturdays and Sundays. Extra hours are planned Dec. 31 from 11 to 5 p.m. The display will be closed Dec. 24 and 25 and Jan. 1.Admission is $5 for adults and $3 for children younger than 12.For more information, call 724-444-6944 or visit the museum's Web site at www.wpmrm.org.

The miniature train display set up by Emlenton Boy Scout Troop 41should open Dec. 11 at Donaldson Motors, 714 River Ave., Emlenton.Hours will be noon to 5 p.m. Saturdays and Sundays through Jan. 30. Visitors can look at the display on weekdays, but the trains won't be running.Admission is free, though donations will be accepted to help with the setup costs.For more information, call 724-867-2293.

The Model Train Club at Passavant Retirement Center,401 S. Main St., Zelienople, will display its handiwork from 4 to 8 p.m. Dec. 5 during Light-up Night at the retirement community.New this year is a second display in an adjacent room, according to the club's Ed Wettlaufer.The exhibit is on the first floor of the main building. It's open regularly from 10 a.m. to noon Tuesdays.For more information, call 452-5400.

Clarion Model Railroad Club presents its train exhibit from 11 a.m. to 9 p.m. Nov. 26 and 27, 6 to 9 p.m. Dec. 3, 10 and 17 and 11 a.m. to 5 p.m. Dec. 4, 11 and 18 at 515C Main St., Clarion.For more information, call 814-223-9719.