Tunnel

6 coins

Austria    3 coins

Railways of the Future

Austrian Railways

Silver, 20 g, ⌀ 34 mm
Semmering Alpine Railway

Silver Niobium Coin

Bi-Metallic, 17.15 g, ⌀ 34 mm
Tunneling

Silver Niobium Coin

Bi-Metallic, 16.5 g, ⌀ 34 mm

Hungary    1 coin

125th Anniversary of the Millennium Underground Railway

Copper Nickel, 27 g

United States of America (USA)    2 coins

Washington Quarter, North Carolina, Blue Ridge Parkway

America the Beautiful Quarters Program

Copper Nickel Clad Copper, 5.67 g, ⌀ 24.26 mm
Virginia

American Innovation $1 Coin Program

Manganese Brass, 8.1 g, ⌀ 26.5 mm
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