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2. Southern Pacific 2472 - Wikipedia

   en.wikipedia.org/wiki/Southern_Pacific_2472

   Southern Pacific 2472 is a P-8 Class 4-6-2 heavy "Pacific" type steam locomotive built by the Baldwin Locomotive Works for the Southern Pacific Railroad (SP) in 1921. No. 2472 is one of three surviving Southern Pacific P-8 class 4-6-2 Pacific locomotives, the other two being Nos. 2467 and 2479. The 4-6-2 designation means it has four leading ...

3. 2-6-6-4 - Wikipedia

   en.wikipedia.org/wiki/2-6-6-4

   In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-6-6-4 is a locomotive with a two-wheel leading truck, two sets of six driving wheels, and a four-wheel trailing truck. All 2-6-6-4s are simple articulated locomotives. Other equivalent classifications are: UIC classification: (1'C)C2 ' (also known as German ...

4. 4-6-2 - Wikipedia

   en.wikipedia.org/wiki/4-6-2

   The introduction of the 4-6-2 design in 1901 has been described as "a veritable milestone in locomotive progress". [3] On many railways worldwide, Pacific steam locomotives provided the motive power for express passenger trains throughout much of the early to mid-20th century, before either being superseded by larger types in the late 1940s and 1950s, or replaced by electric or diesel-electric ...

5. Union Pacific Challenger - Wikipedia

   en.wikipedia.org/wiki/Union_Pacific_Challenger

   Factor of adh. The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short ...

6. 4-4-6-2 - Wikipedia

   en.wikipedia.org/wiki/4-4-6-2

   4-4-6-2. AT&SF locomotive no. 1300, a 4-4-6-2 Mallet type. Under the Whyte notation for the classification of steam locomotive wheel arrangements, a 4-4-6-2 is a locomotive with two pairs of leading wheels, one set of four driving wheels, a second set of six driving wheels, and a pair of trailing wheels. The equivalent UIC classification is ...

7. Water table - Wikipedia

   en.wikipedia.org/wiki/Water_table

   Water table. Cross-section of a hillslope depicting the vadose zone, capillary fringe, water table, and the phreatic or saturated zone. (Source: United States Geological Survey.) The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with groundwater ...