Vertical Alignment for an overpass. A road and bridge are being reconstructed to provide for an increase in grade separation from a high-speed train line. The vertical curve provides for an overpass across railroad tracks that are located from Station 85 70 to Station 86 30, The VPT of the equal tangent vertical curve is at Station 100 00. with elevation 320 ft and a tangent with gradient -4 percent. The gradient at the VPC is 2.5 percent. The maximum elevation of the curve will occur at Station 86-00. Find the station and elevation of VPC and the elevation of the bridge at 86 00 relative to the elevation of VPT. Find (a) the length of the curve: (b) The station of VPC, (c) The elevation at VPC, and (d) The height of the curve at the railroad bridge, Sta 86 00. (e) Assuming a desired design speed of 70 mph, determine if the vertical curve design meets SSD standards.