| 1. Baltimore & Ohio Railroad Photo Tours
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| Virtual photographic mile-by-mile tour of the Baltimore and Ohio, now CSX, Railroad routes in Maryland. Historical descriptions with each photo. |
| http://www.trainweb.org/oldmainline |
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| 2. Bi-County Transitway
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| A proposed Purple Line high-capacity transportation link between Montgomery and Prince George's Counties. Provides photographs, links to proposals and studies, and FAQ. |
| http://www.bi-countytransitway.com |
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| 3. BWI Airport
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| The Baltimore Washington International Airport serves residents and travelers in the Baltimore/Washington Corridor. Includes flight status, directions and parking, customer service, ground transportation, and news. |
| http://www.bwiairport.com |
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| 4. Dillon's Bus Service
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| Bus charter and commuter services between Baltimore, Washington DC, Annapolis, and Bethesda. Company history, charter information, and commuter schedules. |
| http://www.dillonbus.com |
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| 5. Longmead United Against the ICC
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| A grassroots organization opposed to construction of the Intercounty Connector through the community of Longmead Crossing. |
| http://www.luaicc.org |
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| 6. Marylanders for a Second Crossing
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| Citizens group seeking to promote plan for a second crossing over the Potomac to allieviate chronic traffic congestion. |
| http://secondcrossing.org |
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