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by DoDo
back from the front page
Towards the end of the Steam Age, railways, especially US railroads, built a bedazzling array of extra-large freight locomotives. Union Pacific's "Big Boys" became the most famous, but they weren't the biggest! Among US railfans, the issue sparks never-ending debates. For each rival, there is a story behind the lack of recognition. Below the fold, I first tell that of the Chesapeake & Ohio class H-8 "Allegheny":
Largest locomotive - by what measure? You could actually use four (or six):
The Alleghenys beat the Big Boys in two categories. At 7500 HP peak/c. 6600 HP sustained (drawbar), only Pennsylvania's Duplex types (see one in my earlier Fast Steam diary) could match their power (Big Boy: 6290 HP). At 350 (metric) tons without tender, they were also a bit2 heavier - but not by design, and that explains why they missed the spotlight. For, the first batch was delivered 25 tons overweight. At over 37 (metric) tons axle-weight, they were more than what tracks were certified for - so while C&O got angry with the manufacturer, they kept the numbers confidential... In service, the H-8 was successful - unlike most other bigger-than-Big-Boys. Hence, I'll keep the suspense3, and will show two more only in the next instalment of a now starting three-part mini-series: the one on failed designs (which again flows over into the third: on crazed designs). Below I will only show two European giants - which have a story too. The Hungarian Railways (MÁV) class 601
In pre-WWI Hungary, there were a lot of mountains to scale. Designed for such lines just prior to the war, the 601 class was successful. However, after the war, both the country and the locomotive park was cut up. No big mountains remained in rest-Hungary, while the 601's lines in Croatia and Slovakia were soon electrified - left without fitting jobs, the locos were retired early, not one is preserved. Which is a shame: when built, they were the most powerful (at 1735 kW/2330 HP), second strongest (with US standard calculation: 222 kN/49,945 lbs), heaviest with tender (162.5 t/358,250 lbs) and second without (109.4 metric tons/241,185 lbs) in Europe. (More in German here.) The Belgian Railways #2096 "Franco" prototype
The largest steam locomotive ever built in Europe was one of its kind. What you see on the outside: a cross between a Garratt and a Mallet, its three articulated parts rest on four groups of wheels (driven by four pairs of cylinders). Its inside is even stranger: like Siamese twins, there are two fire-boxes side-by-side at center, separately feeding the two boilers (forward/back), which were a special Italian design. (Douglas Self - who scanned the above photo - has more description, Gunter's has more data on #2096.) Its European record on power (2200 kW/3000 HP) was beaten later, but on tractive effort (US standard calculation: 419 kN/94,220 lbs), weight (248 metric tons/546,750 lbs) and length (31 m/101'8.5"), it remains unsurpassed - the "Franco" was big even by US standards. This monster from 1932, tough not a failure, remained a demonstration piece. It was eventually cut up and made into two locomotives by the German occupiers during WWII, both parts ended up in Poland after the war - later unfortunately scrapped.
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Monday Train Blogging: Bigger Than Big Boy | 40 comments (40 topical, 0 editorial, 0 hidden)
Monday Train Blogging: Bigger Than Big Boy | 40 comments (40 topical, 0 editorial, 0 hidden)
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