Colorado & Southern switchback help

I am trying to figure out how the Colorado & Southern railroad navigated the 500 ft. or so altitude change between Black Hawk, CO and Central City, CO - I realize they used a switchback, but I haven't been able to find any old maps online that may show the route between these two towns. Does anybody have a link that will help me out?

thanks,
Todd

Not very 'close up' but shows the switchbacks:
http://www.lib.utexas.edu/maps/topo/col ... y-1903.jpg
Decent photos of switch back:
http://digital.denverlibrary.org/cdm/si ... 4534/rec/1
http://www.narrowgauge.org/ngc/html/exc ... khawk.html
Also Google Colorado Central Railroad, who built this line before being
taken over by the C & S

Try this page - it seems to have it all . http://gilpintram.com/themap.html
This is the "Gilpin map" which gives a big view, plus the links to close-ups of individual towns and other maps.
JS

Thanks for the replies to my inquiry, the links offered have been helpful. I spent some time up around Black Hawk recently to try to find some existing evidence of the railroads up there but didn't have much luck, I guess partly because of my lack of knowledge of the area but also because it seems a good amount of the canyon has been carved away to allow for construction of casinos.