Trench, 2 tracks, ramp.
10m wide, from 0 to 10m deep.
Length is flexible, but one should aim for a little over 500m so to get a 2% grade.
Max length: 800m (1.25% grade)
Note 1: There is an alternative floor spline available ('Trench T2 brick floor alternative') for when you prefer a trench going less deep.
Note 2: Needs Digholes to show correctly.