Home
»
Trains Magazine
»
Forums
»
General Discussion
»
Duplex Steam Locomotive / Steam discussion

Edit post

Edit your reply below.

Post Body
Enter your post below.
You'd still run into problems with a shallow firebox above drivers. One of the advantages of the trailing truck was having a deep firebox with more volume which provided better combustion. Good examples of engines in existence today are Southern's K 2-8-0s of 1903 (630 and 722) and the Ms 2-8-2 of 1911 (4501). Both have 54 Sq, Ft. grates but the deeper firebox behind the drivers of the 2-8-2 made it capable of supplying cylinders 5" bigger than those of the 2-8-0 (22" vs. 27" - as built; both the 2-8-0s were rebuilt as class Ks-1 with superheaters, lower boiler pressure and 24" cylinders - the 4501 was built with a superheater). Look at the difference between UP 3985 and N&W's 1218. The Challenger has a grate area of 132.2 Sq. Ft. and a 106" combustion chamber to give it adequate volume to supply its 21x32-inch cylinders; flue length was an even 20 feet. The grate area approaches that of the Lima 2-6-6-6, but evidently is necessary to get the required volume. Being able to place the firebox totally behind the drivers allowed the 1218 to use a 122 Sq. Ft. grate in conjunction with a 114" combustion chamber; flues could be 24 feet long. And this combination was completely satisfactory to supply 24x30-inch cylinders. There were definite advantages in having the deep firebox. Old Timer
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag