Question: On what day did Union Station first open?
About the article "Union Station (Washington, D.C.)", section "Opening and operation".

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History of construction.
Expansion plans that included the route of the current Line 5 first appeared in the 1980s.
Construction began in 1987, but the collapse of the Soviet Union and the resultant financial crash forced the city to freeze the construction of the Frunzenskiy radius (the section south of Sadovaya).
However, the city officials decided to continue building the Primorsky radius (the section north of Sadovaya), and incorporated this section in what was then known as Pravoberezhnaya Line (the current-day Line 4), until the construction of Frunzensky radius could be resumed.
This is the reason that the Primorsky radius remained a part of Line 4 for the ten years.
Subsequent to the formal opening of Line 5, and the connection of the Primorsky and Fruzensky radii in March 2009, Obvodny Kanal station was opened on the existing open section of line on 30 December 2010.
The long-awaited Admiralteyskaya station, serving many of the historic and tourist sites in the city, was opened on 28 December 2011, also on an existing open section of line.
Prior to this date, most trains bypassed this partially completed station, save for a few trains that dropped off and picked up construction workers. 
Early days.
After the license to establish 2LT was granted to Midwest Radio Network (then named Lithgow Broadcasters Pty Ltd) in 1938 it was proposed a trade union lease the license on a ten year term basis, and for the union, the Professional Radio Employees Institute, to build and own the station, a first for a union in Australia.
The proposal did not eventuate and Midwest proceeded to develop the station, building a transmitting aerial and a studio at Bowenfels.
The station was to broadcast 10 hours a day initially. 
Stroud station has two platforms and is served by First Great Western.
The station has a ticket office, located on the Swindon bound platform, which is open for the majority of the day, seven days a week 
Leopoldplatz station first opened on 8 March 1923, along with the rest of the newly built line between the stations Stettiner Bahnhof (now Naturkundemuseum) and Seestraße, now part of the U6 line.
Only much later on 28 August 1961 did the second, deeper platform open to serve what is now the U9 line.
The building of this new platform involved a complete reconstruction of the older U6 platform, which was transformed from having a single island platform to having two platforms flanking the tracks.
This was done in order to facilitate an easier transfer between the two lines served, and makes it one of very few stations on the U6 line to have such a layout.
Until 1 September 1964, Leopoldplatz was served by several tram lines.
The tracks have since been removed but Leopoldplatz remains a transport hub, served by five bus lines during the day and three lines at night.
A small convenience store and cafe are located within the station. 
Westbourne Park is a London Underground station on the Circle and Hammersmith and City lines, between Ladbroke Grove and Royal Oak stations, and in Travelcard Zone 2 in The Royal Borough of Kensington and Chelsea .
Although the Metropolitan Railway had been extended to Notting Hill and Hammersmith on 1 June 1864 the first station by this name did not open until 1 February 1866.
This closed on 31 October 1871 to be replaced the following day by a new station constructed to the east of the original.
In February 1913 a bomb - possibly planted by the Suffragettes - was discovered at Westbourne Park station.
It is in close proximity with Harrow Road W9.
Adjoining the station is the Tower Transit bus garage.