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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.
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 ...
A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. While it would be possible to make an articulated locomotive of this arrangement, the only 4-4-4-4s ever built were duplex locomotives —with two sets ...
While Valve is specifically tried to keep the single-player campaign accessible, all bets are off in the co-op mode. For example, the team avoided timed puzzles in Portal 1; however, Portal 2 co ...
Portal 2 is a 2011 puzzle-platform game developed by Valve for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. The digital PC version is distributed online by Valve's Steam service, while all retail editions were distributed by Electronic Arts. A port for the Nintendo Switch was included as part of Portal: Companion Collection .
Midland Railway Class 2 4-4-0. The Midland Railway Class 2 4-4-0 was a series of 12 classes of 4-4-0 steam locomotives built by and for the Midland Railway between 1876 and 1901 while Samuel W. Johnson held the post of locomotive superintendent. They were designed for use on express passenger trains but later on were downgraded to secondary ...
"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 ...