Question: Name the valley where Miralago is a part of it and Bernina Express line cross it

Context paragraphs:
Harbor Transitway: The Harbor Transitway is an 11 mi shared-use bus corridor (transitway) and high-occupany toll roadway that runs in the median of Interstate 110 (Harbor Freeway) in Southern California.  The main bus service operating on the busway is the Metro Silver Line which was introduced on December 13, 2009.  The Metro Silver Line bus rapid transit line runs on the Harbor Transitway from Harbor Gateway Transit Center to Downtown Los Angeles and continues to El Monte Bus Station.  The line operates daily with frequent service.  In addition to Metro Silver Line, other Metro bus and municipal bus routes also operate on the Harbor Transitway.  They include Metro Express lines 442, 460 and 550, Torrance Transit line 4, Gardena Transit line 1X and Orange County Transportation Authority lines 701, 721.  Metro Express lines 442 and 550 operate only during weekdays peak hours.  Metro Line 442 operates peak a.m. northbound only and southbound p.m. only.  Torrance Transit line 4, Gardena Transit line 1X, and Orange County Transportation Authority: 701, 721 operate only during weekday peak hours.  Metro Express line 460 operates daily along with the Metro Silver Line.  Busway bus lines originate from Downtown Los Angeles and El Monte, with final destinations in Disneyland, and Disney California Adventure Park located in Anaheim, Knott's Berry Farm, Artesia, Fullerton, Gardena, Hawthorne, Huntington Beach, San Pedro and Torrance.

Bernina Express: The Bernina Express is a train connecting Chur (or Davos) in Switzerland to Poschiavo in Switzerland and Tirano in Italy by crossing the Swiss Engadin Alps.  For most of its journey, the train also runs along the World Heritage Site known as the Rhaetian Railway in the Albula / Bernina Landscapes.

Line 10, Chengdu Metro: Line 10 of the Chengdu Metro () or Airport Express Line () runs from Wuhou District to Shuangliu District/Xinjin County.  It starts at Taipingyuan and ends at Airport T2/Nanhe.  The total length is 38.2 km.  Line 10's color is sky.  Airport Express Line began construction in July 2014 (Phase I) or 2016 (Phase II), and will be completed in October 2017 (Phase I) or 2020 (Phase II).  from Taiping yuan to Airport T2/Nanhe.  It's the first line in Chengdu Metro to use A size coaches for service.

Line 13, Guangzhou Metro: Line 13 of the Guangzhou Metro () is a rapid transit rail line under construction in Guangzhou.  It is envisioned to be the "East West Express Line" complimenting Line 3 which is the "North South Express Line".  The line serves some of the most popular areas in Guangzhou such as Luochongwai Bus Terminal, Zhujiang New Town CBD and Yuancun while passing through some of the densest and most populated areas of Tianhe, Yuexiu, and Liwan Districts.  Due to the density of the areas served, demand for this line is expected to be high with average daily ridership predicted at 1.44 million passengers per day when both phases are complete.  Knowing this engineers designed the line to use 8 car wide body A size rolling stock, the highest capacity rolling stock in the Guangzhou Metro to date.  To fulfill its role as an express service the line is designed with a service speed of 100km/h.  The first phase which is under construction will run from Yuzhu in Huangpu to Fuchangqiao in Zengcheng, and is planned to open in late 2017 or 2018 and is expected to have a serve 220,000 riders per day.  The first section of Phase 2 between Yuzhu to Tianhe Park is preparing for construction.

Bernina railway: The Bernina railway is a single-track railway line forming part of the Rhaetian Railway (RhB).  It links the spa resort of St. Moritz, in the Canton of Graubünden, Switzerland, with the town of Tirano, in the Province of Sondrio, Italy, via the Bernina Pass.  Reaching a height of 2,253 m above sea level, it is the highest railway crossing in Europe and the third highest railway in Switzerland.  It also ranks as the highest adhesion railway of the continent, and – with inclines of up to 7% – as one of the steepest adhesion railways in the world.  The Bernina railway is also notable for its big height difference on the section between the Bernina Pass and Tirano: (1824 m ), allowing passengers to see glaciers and palm trees on the same line.

Dome car: A dome car is a type of railway passenger car that has a glass dome on the top of the car where passengers can ride and see in all directions around the train.  It also can include features of a coach, lounge car, dining car, sleeping car or observation.  Beginning in 1945, dome cars were primarily used in the United States and Canada, though a small number were constructed in Europe for Trans Europ Express service, and similar panorama cars are in service on Alpine tourist railways like the Bernina Express.

Miralago: Miralago is a small village in the Poschiavo valley, at the southern end of the Lago di Poschiavo.  It lies on the Bernina Express line.

Delhi Aerocity metro station: The Delhi Aerocity (Hindi: दिल्ली एरोसिटी ) Metro Station is located on the Delhi Airport Express Line of the Delhi Metro.  This station is located near the NH-8 highway.  While the Airport Express Line was opened on 23 February 2011, this station was not opened to the public until Independence Day, Monday 15 August 2011, to allow a buildup of demand.

Dhaula Kuan metro station: The Dhaula Kuan (Hindi: धौला कुआँ ) Metro Station is located on the Delhi Airport Express Line of the Delhi Metro.  This station is the only elevated one along the Airport Express Line and features check-in facilities.  It did not commence operations along with the rest of the line and trains ran through the station without stopping initially.  It was opened to the public for the first time on Independence Day, 15 August 2011.

Line 18, Chengdu Metro: Line 18 of the Chengdu Metro () or New Airport Express Line () runs from Gaoxin District to Jianyang City.  It starts at Chengdu South Railway Station and ends at Chengdu Tianfu International Airport.  The total length is 59.27 km.  Line 18's color is teal.  New Airport Express Line began construction on late 2015, ends on mid 2020.  from Chengdu South Railway Station to Chengdu Tianfu International Airport.

Supporting paragraphs: Miralago Bernina Express
Answer: the Poschiavo valley