D&RG at Salida bisected itself with a couple of sidings over the years that were in turn dual-gauged, running through the original Mainline to Gunnison.
Centennial Photo Archive.
South of Denver as mentioned by John, and posted here by Jeff Ramsey...
http://c-sng-discussion-forum.41377.n7.nabble.com/Pictorial-Supplement-to-Train-Time-in-Morrison-tp4094p4200.htmlAt Gunnison the DSP&P crossed the Crested Butte Branch at 90° where there were two sidings and maintrack. The D&RG in Gunnison had a loop of track to serve the La Veta Hotel which was also bisected by the DSP&P.
The only photo I've ever seen showing the intersection at the C.B. branch, and at that(I'm not certain) if there is only grading in place before tracklaying. The DSP&P Roundhouse is visible(completed?), surely the tracks from the East would be in place.
X-9321
http://digital.denverlibrary.org/cdm/fullbrowser/collection/p15330coll22/id/7908/rv/singleitem/rec/161In Silverton, the Silverton Northern crossed the SG&N at 60° on Cement Street, I don't think that the D&RGW spur up 12th Street existed at the time of the SN.
MCC-1787
http://digital.denverlibrary.org/cdm/fullbrowser/collection/p15330coll22/id/4365/rv/singleitem/rec/2I'm surprised Roper hasn't barked about this remnant of the C&S (DSP&P) narrow gauge....
http://coloradosouthern.blogspot.co.nz/2015/12/help-to-identify-location.htmlAnd who could not forget this one, possibly the only diamond crossing of a spur by a siding on the Narrow Gauge anywhere!
http://c-sng-discussion-forum.41377.n7.nabble.com/Idaho-Springs-Mid-Town-Ore-Processing-Part-3-tp2512.htmlSanborn Map
Photo copyright and courtesy of Colorado School of Mines.
On the Very Narrow Gauge there were these examples,
On the Argentine Central at Vidler/Waldorf
MCC-693
http://digital.denverlibrary.org/cdm/fullbrowser/collection/p15330coll22/id/78179/rv/singleitem/rec/38Up at Silver Lake near Silverton.
Robert D. Stull Photo.
Which most likely is this crossing
X-62250
http://digital.denverlibrary.org/cdm/fullbrowser/collection/p15330coll22/id/14934/rv/singleitem/rec/257And at the Alma-Lincoln...
http://c-sng-discussion-forum.41377.n7.nabble.com/Stanley-Mills-Part-One-The-Lincoln-and-Alma-Lincoln-Mills-tp3389.htmlCHS.X5489
http://digital.denverlibrary.org/cdm/fullbrowser/collection/p15330coll21/id/11493/rv/singleitem/rec/8At Park City Utah.
USGS
And the best for last, the Diamond&Caldor in California.
Grandt Photo
North Pacific Coast crossing the SP.
Grandt Photo
C&S Crossing D&RG at Leadville.
Mac Poor Photo.
UpSideDownC
in New Zealand