Talk:Columbia and Nehalem Valley Railroad
Latest comment: 8 years ago by Anmccaff in topic Three phases of the bridge at McBride Creek
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Columbia & Nehalem River Railroad edit
Not to be confused with the Columbia & Nehalem River Railroad, please. --NearEMPTiness (talk) 09:08, 23 March 2016 (UTC)
Three phases of the bridge at McBride Creek edit
It looks to me, as if the bridge at McBride Creek was built in three phases:
-
Orignal bridge -
After strengtheining the upper mid section -
After strengthening also the lower mid section
_on_the_Columbia_and_Nehalem_Valley_Railroad,_Columbia_County,_Oregon_(3228984849).jpg)
The diagonally placed struts after strengthening the upper mid section show that the horizontal centrifugal forces of the heavy trains in that bend were seen as a problem. Apparently the builders were worried that the bridge moves sidewards The third picture nicely shows the water barrels for fire fighting, if a spark from the locomotives had inadvertantly incinerated the bridge. Or were these temporarily installed to pull up the lengthwise placed logs? --NearEMPTiness (talk) 07:47, 26 March 2016 (UTC)
- Several points: It is obvious at a casual glance that there is either more than one location involved, or the topography changed, radically, between some of the photos. The latter isn't unheard of in logging, of course.
- Next, "centrifugal force" is dependent on speed; have you ever actually watched a shay in operation?
- Also, note the difference in batter between the strutted section and that without. The cribbage may have been harvested. The cribbage may have been replaced for other reasons. It may, in fact, be a different crossing entirely. But whatever the case, the batter has changed. Anmccaff (talk) 15:28, 26 March 2016 (UTC)