As luck would have it I've been looking at the North Wales line map in the Sectional Appendix.
Shotton Low level station is at 186m 77ch, a speed limit change at 188:02, NR's route boundary at 188:40, Rockliffe Hall SB at 188:74, Rockliffe Hall tunnel from 189:47 to 189:51, and Pentre LC (UWC) at 190:67.