Lot C210 mileage is from 16k+800-21 k+577, contains 2.63km of viaduct (excluding Hueilung tunnel). Lot C215 mileage is from 28K+080~64K+139 contains 29.44km of viaduct (excluding tunnel and cut/fill section). The cut and cover tunnel is about 2.74km, the embankment section is about 0.8km. The most common span length of the viaduct is 30m for C215 and 40m span for C210. For the bridges crossing existing roads, three span continuous rigid frame or continuous girders were used. The typical structure type for viaduct is three span continuous rigid frame. The cut and cover tunnel contains two type of rail tracks: two track and two to four transition tracks. For the viaduct foundation, spread footing or pile foundation were adopted depending on the soil stratum conditions.