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2. 4-8-4 - Wikipedia

   en.wikipedia.org/wiki/4-8-4

   Union Pacific 844, the only steam locomotive never retired by a North American Class I railroad. The 4-8-4 wheel arrangement was a progression from the 4-8-2 Mountain type and, like the 2-8-4 Berkshire and 4-6-4 Hudson types, an example of the "Super Power" concept in steam locomotive design that made use of the larger firebox that could be supported by a four-wheel trailing truck, which ...

3. Bombardier 4.8 - Wikipedia

   en.wikipedia.org/wiki/Bombardier_4.8

   The Bombardier 4.8 is a recreational sailboat, built predominantly of fibreglass, with polyurethane flotation and aluminum spars. It has a fractional sloop rig, a raked stem, a vertical transom, a flip-up, transom-hung rudder controlled by a tiller and a flip-up centreboard keel. It displaces 300 lb (136 kg) and can accommodate four people. [1] [2]

4. 4-8-8-4 - Wikipedia

   en.wikipedia.org/wiki/4-8-8-4

   A Big Boy locomotive.This example is Union Pacific 4014. 4-8-8-4 wheel arrangement. A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck.

5. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   110–119 – Y8A 8-pin steel tube base; Rimlock B8A; 130–139 – Octal; 150–159 – German 10-pin with spigot; 10-pin glass with one big pin; Octal; 160–169 – Inline wire-ended Pencil tubes; Y8A 8-pin steel tube base; 170–179 – RFT 8-pin; RFT 11-pin all-glass gnome tube with one offset pin; 180–189 – Noval B9A; 190–199 ...

6. Iron pipe size - Wikipedia

   en.wikipedia.org/wiki/Iron_pipe_size

   The iron pipe size standard came into being early in the 19th century and remained in effect until after World War II. The IPS system was primarily used in the United States and the United Kingdom. In the 1920s, the Copper Tube Size (CTS) standard was combined with the IPS standard.

7. 4-8-8-2 - Wikipedia

   en.wikipedia.org/wiki/4-8-8-2

   Under the Whyte notation for the classification of steam locomotives, a 4-8-8-2 is a locomotive with four leading wheels, two sets of eight driving wheels, and a two-wheel trailing truck. Other equivalent classifications are: UIC classification: 2DD1 (also known as German classification and Italian classification) French classification: 240+041