|Offer Type||Offer Date||Cost||Buy XP||Level||Restrictions|
|Limited|| 18 Nov 2014-|
1 Dec 2014
|Used in achievements:
| Mallet's original design was a compound locomotive, in which the steam is used twice, first in a set of high-pressure cylinders, then in a set of low-pressure cylinders. With all six cylinders operating at their full pressure, the Mallet type "Triplexes" produced huge amounts of tractive effort that may have been the highest of any steam locomotives before or since.|
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