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Discussion in 'FAQs' started by cidchase, Jun 12, 2002.
What is a double slip??
Thanks from Olive Branch
Cid, A doubleslip is a pair of turnouts which are arrainged in such a way as to appear as a crossing. There are two sets of points with god knows how many frogs. Primarily used by prototype roads in situations where space is at a real premium, such as throats leading into passenger terminals.
That is quite an arrangment. It sure could compact a layout!! I think i'll wait until my track skills are farther along before I try that
one. I think it's the ideal demo for the matrix idea, setting a route with one pusbutton!!
While I'm here, is there a standard clearance distance from the rail to trackside equipment, specifically a switchstand?? What's the maximum width for a protoype loco? I suppose it has changed over the years, and by company. I'm trying to stick to pre-war 20th century, maybe 1900-1930? but I'm not nailing it down closer than that. As I'm sure you know, it's somewhat of a challenge finding the sources to correctly identify compatible road names, equipment, etc. I'm trying to get my tax dollars' worth out of my local library.
standard dimensions and clearances
Found some relevant data here:
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Re: standard dimensions and clearances
OK Cid, I finished reading that, find any thing else
You know what they say: if you haven't read it, it's still news. So most things about this hobby are still news to me!! I saved those tables in a Word file for future ref. I'm still hunting!!
A post from Trainboard.com:
"at a railroad museum, there was a large scale model of a steam locomotive: two sets of drive wheels with the cylinders between the sets of drive wheels (cylinders were back-to-back)
ooOOO cc OOOoo--tender
Were there steam locos with this arrangement?"
Was this guy dreaming or is there really a 4-6-6-4 articulated design with cyl's back-to-back?? I haven't found any pics of one yet. Not that I need to know, but........?
It's getting warmer in Mississippi
I replied to that post, saying it must be a Challenger, but missed the bit on the cylinder arrangement ! There was a later reply saying it must be a foreign (oops - non US for this forum) arrangement, possibly South African.
I've put in a double slip. Wiring the electro frog slip is a bit of a doozie, and takes a bit of understanding. Once you've got it right though, it's fine. I used DPDT switches attached to the turnout motors to get the auto-polarity on the frogs correct, and, of course appropriate insulation of the frogs from the lead-in rails etc.