Yup.

As soon as you enter the area with the beacon go to the left. On the left it will look like 4 rectangular boxes. It's in the middle of the area, it's a foam canister. Turn on your helmet for help if needed.

No, sea-level pressure and station pressure are not the same. Station pressure is the atmospheric pressure measured at a specific location, while sea-level pressure is the station pressure adjusted to sea level using a standard formula to account for differences in elevation.

Whittington Low Level railway station ended in 1963.

Aberdare Low Level railway station was created in 1846.