Moonman posted:JP,
I like the Double 11° #175 for the crossover. When you total the cost of 4 switches and a crossover separately, they are more than a #175. It should be somewhere prominent as it is a very cool looking junction. Look at the photos of Alex M.'s layout on the forum.
I don't think Elliot( Big_Boy_4005, My Dream/Nightmare thread) uses any double crosses- but he didn't have any left over from his mall layout. But you can get a look at how a long double main looks. Also, throughout the thread are tutorials on various topics. Tortoise machines for slow action switching from under the layout or manual switch controls as an example. Ballasting-soon to come, but early on he purchased about 600lbs. of crushed granite from a local stone business. He cuts his own roadbed from Homosote on a table saw.
His track laying techniques are wonderful. Draws his centerlines and just builds it.
I'm not sure if you made a decision on the double crossover, Carl's post is a month old. He's correct, I don't have any on my layout, but it's not only because I didn't have any "in stock", but I'm just not a big fan of them. I use 4" spacing, so the regular one would have forced me to widen my centers. The other thing is real railroads don't really use them.
Typically, they are for tight situations, and are more commonly found in passenger related operations, terminals, subways, light rail, etc. I have the space, and I just use single crossovers, sometimes times in pairs, sometimes not, as the situation demands.
It's a little hard to see, but I used four single crossovers to span 3 tracks. This is actually what the real railroads use, except they have five tracks to span.