What is "blue line"

n. (context ice hockey English) Either of the two thick blue lines on the ice that separate an attacking zone or defending zone from the neutral zone.

The Blue Line is a light rail line in the system of mass transit in Dallas, Texas ( USA), operated by the Dallas Area Rapid Transit system. Along with the , it is one of the original modern rail lines in Dallas.

The Blue Line, also known as the O'Hare-Congress Line and the West-Northwest Line, is a long Chicago "L" line which extends through the Loop from O'Hare International Airport at the far northwest end of the city, through downtown via the Milwaukee-Dearborn Subway and across the West Side to its southwest end at Forest Park, with a total of 33 stations. It is the CTA's second busiest rail line, with an average of 186,796 passengers boarding each weekday in September 2012.

The Blue Line and Red Line are the only two routes of the Chicago "L" system to currently run 24 hours a day and is one of only six mass-transit rail lines in the United States to do so (the others being the PATCO Speedline, Staten Island Railway, the PATH lines, one line of the Minneapolis-St. Paul Metro and the New York City Subway). The Blue Line is also one of only two lines with more than one station with the same name, with the Green Line being the other (It has two stations at Harlem Avenue: one in the Kennedy Expressway on the Northwest side and one on the south side of the Eisenhower Expressway in Forest Park, Illinois. It also has two stations on Western Avenue: one on the O'Hare branch and one on the Congress branch). The Blue Line also has only three in-system transfers (all in the Loop), contains a combination of both the oldest and newest portions of 'L' tracks, and does not share tracks with any other 'L' line.

Before the adoption of color-coded names, the Blue Line was referred to as the West-Northwest Route (which it is still sometimes referred to as today) or more commonly, the O'Hare-Congress-Douglas route for its three branches. The Congress and Douglas branches were renamed for their terminals, Forest Park and 54th/Cermak, when the current color naming system was adopted in 1993. Blue Line service on the Douglas Branch was discontinued in April 2008 and replaced by the Pink Line.

The Blue Line is one of five 'L' lines that run into Chicago suburbs, with the others being the Green, Purple, Pink, and Yellow lines. The Blue, Green, and Purple Lines are the only three rail lines that run through more than one suburb, with the Green and Purple Lines running through two, but the Blue Line actually runs through three, making it the rail line that runs through the most suburbs on the Chicago 'L' system.

The Blue Line is a rapid transit line in the Greater Boston metropolitan area, one of four subway lines operated by the Massachusetts Bay Transportation Authority (MBTA). It runs from Bowdoin station in downtown Boston under Boston Harbor to East Boston and Revere on the inner North Shore, where it terminates at Wonderland. The stop at Airport Station, with a free shuttle bus to Logan International Airport, is one of two rapid transit connections to the airport. The line was assigned the blue color in 1967 during a systemwide rebranding because it passes under Boston Harbor.

The East Boston Tunnel was built as a streetcar tunnel in 1904; after an extension to Bowdoin in 1916, it was converted to heavy rail metro rolling stock in 1924. In 1952 and 1954 the line was extended along the former route of the Boston, Revere Beach and Lynn Railroad, in a project intended to reach Lynn but ultimately cut short to Wonderland. Further extensions to Lynn and Charles/MGH downtown are long-planned but not yet funded.

Blue Line may refer to:

The Blue Line is a border demarcation between Lebanon and Israel published by the United Nations on 7 June 2000 for the purposes of determining whether Israel had fully withdrawn from Lebanon.

At the same time, an extension, expressly "not to be called the Blue Line" corresponds to the nominal Lebanese-Syrian border between Lebanon and the Israeli-controlled Golan Heights.

Blue Line was a charter passenger airline with its head office in Building B of Paris Nord 2, Parc des Lumières in Roissy-en-France, France. It operated VIP flights and charter services for tour operators, as well as wet-lease contracts. Its main base was Paris-Charles de Gaulle Airport. It ceased operation on 6 October 2010, after being liquidated by the Tribunal de Commerce de Pontoise.

The Blue Line of the Delhi Metro system in Delhi consists of 44 metro stations from Dwarka Sector 21 to Noida City Centre (Sector 32) with a length of 51.35 km and a branch line consisting of 7 stations from Yamuna Bank to Vaishali, with a length of 8.85 km.

The is a line in the Yokohama Municipal Subway system of Yokohama, Japan, operated by Yokohama City Transportation Bureau. Line 3 runs from Azamino to Kannai, and Line 1 runs from Kannai to Shōnandai. All the trains join these two lines. This is the second-longest subway line in Japan at 40.4 km after the 40.7 km long Toei Ōedo Line in Tokyo.

The Blue Line of the Washington Metro in the United States consists of 27 rapid transit stations from Franconia–Springfield to Largo Town Center. It has stations in Fairfax County, Alexandria and Arlington, Virginia, the District of Columbia, and Prince George's County, Maryland. Thirteen of the line's stations are shared with the Orange Line, 18 are shared with the Silver Line and 9 are shared with the Yellow Line. Only one station – Arlington Cemetery Station – is exclusive to the Blue Line.

The Blue Line is one of the four lines of the Montreal Metro in Montreal, Quebec, Canada. It was the fourth to be built, notwithstanding its alternate official name of "Line 5" ( Line 3 was planned, but never built). Unlike the other three routes, the Blue Line does not serve the city's main Metro station, Berri-UQAM.

The line is served by a single yard located between Parc and de Castelnau stations which is completely underground and occupies a small portion underneath Jarry Park. Another service facility is located at the 500-metre end tracks following Snowdon station, but is rarely used by the Société de transport de Montréal (STM).

On September 20, 2013, a 7-km extension northeast to St. Leonard and Anjou was announced by the STM and the Quebec government. The extension is to include five new stations and is planned to be operational by 2020. On May 28, 2014, it was announced that the project would be reviewed in priorities after the new government took over, and that if accepted again, construction would start in 2017.

The Blue Line is a light rail line running north-south between Long Beach and Downtown Los Angeles, passing through downtown LA, South Los Angeles, Watts, Willowbrook, Compton, and Long Beach in Los Angeles County; it is one of six lines in the Metro Rail System. Opened in 1990, it is the system's oldest and second busiest line with an estimated 28.48 million boardings per year . The Blue Line Fleet has 69 cars. It is operated by the Los Angeles County Metropolitan Transportation Authority.

The Blue Line passes near the cities of Vernon, Huntington Park, Lynwood, and Carson. The famous Watts Towers can be seen from the train near 103rd Street station. The under-construction Regional Connector would directly link this line to and beyond.

The Blue Line is the term used in New York state for the boundaries of the Adirondack and Catskill parks, within which can be found the state's Forest Preserve. The state constitution requires that any property owned or acquired by the state in those parks "be forever kept as wild forest lands" and prohibits it from selling or transferring them in any way (save amending that section of the constitution to allow specific transactions).

It is so called because blue ink was used when they were first drawn on state maps. That started a tradition that persists to this day (although private mapmakers have just as often used green). While they were originally meant merely to guide the acquisition of future Forest Preserve land, over time they have come to define and have legal impact on all lands, public and private, within them.

The Blue Line, of the St. Louis MetroLink, is a light rail service - operating between 24 stations in Greater St. Louis. It is the newest line in the system.

The Blue Line is a proposed line on the Dubai Metro network in Dubai, United Arab Emirates.It is currently approved for construction. This was originally proposed for construction starting along with the Purple Line and completion in 2012. Due to the recession it was taken under reconsideration and the RTA have fixed a deadline of 2014 for completion of this line. The Blue line will run between Dubai International Airport and currently opened new airport Al Maktoum International Airport,along Emirates Road.

The Blue Line of the Taoyuan Metro is a future rapid transit line it will share portion of it rail tracks with Taoyuan International Airport MRT system. The route from Airport Terminal 2 Station to Bade Station will total a length of .

The Blue Line is a Pittsburgh Light Rail line that runs between Downtown Pittsburgh via the Overbrook neighborhood to Library (formerly the 47L Library via Overbrook route) and South Hills Village (formerly 47S South Hills Village via Overbrook).

The Blue Line or Line 1 is one of the two lines of Chennai Metro, Phase 1 Project. The line stretches from Chennai International Airport to Washermanpet with further extension to Wimco Nagar. The line consist of 25 Stations where 17 stations belong to phase 1 and the rest 8 stations belong to the extension. Out of the 17 stations 11 stations are underground and 6 are elevated.