underpass

I am wishing to cross one track with another by an underpass but when I use the sink tool to get the depth to underpass the surface track the side of the recess have a tapered angle on both sides .Now what I am hoping to get is a straight vertical side and Ive tried all what I know to get this result with dismule failure any help to put me in the right direction would be very welcome.manythanks George
 
Find a suitable bridge or make your own up from parts by FMA for the track going over. For the track beneath you can use wall splines to make up the sides of the underpass.
 
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