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Portal is a series of first-person puzzle-platform video games developed by Valve.Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2 (2011), center on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility.
Swiss classification: 2/3+2/3 The UIC classification is refined to (1'B)B1' for a Mallet locomotive . A similar wheel arrangement has been used for Garratt locomotives , but it is referred to as 2-4-0+0-4-2 since both engine units can pivot.
4-4-2+2-4-4. Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-4-2+2-4-4 is a Garratt articulated locomotive. The wheel arrangement is effectively two 4-4-2 locomotives operating back to back, with each power unit having four leading wheels on two axles in a leading bogie, four powered and coupled ...
All scrapped. [ 1] Atlantic Coast Line 4-4-2 were express passenger tender locomotives built by Baldwin Locomotive Works (at that time known as Burnham, Williams & Co), initially for the Atlantic Coast Line Railroad as classes I/I-2 and I-3. They were the first design in the world to exploit the larger boiler and firebox possible with a 4-4-2 ...
"Steam for Schools" is Valve's next push into edutainment. This summer, educators can apply for beta inclusion in the program, which includes a "limited version of Steam" featuring Portal 2, the ...
Single-player, multiplayer. Portal Reloaded is a 2021 modification for Portal 2, created by developer Jannis Brinkman. As in the official Portal series, gameplay involves solving puzzles by manipulating portals, which allow the player to move through chambers. The mod also allows the player to shoot a third "time portal", allowing traversal ...
The Windows version of the game is also available for download separately through Valve's content delivery system, Steam, [1] and was released as a standalone retail product on April 9, 2008. [53] In addition to Portal , the Box also included Half-Life 2 and its two add-on episodes, as well as Team Fortress 2 .
The 4-4-2T is the tank locomotive equivalent of a 4-4-0 American type tender locomotive, but with the frame extended to allow for a fuel bunker behind the cab. This necessitated the addition of a trailing truck to support the additional weight at the rear end of the locomotive. As such, the tank version of the 4-4-2 wheel arrangement appeared ...