Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Timeline of railway history:

"

* 1793 – the Butterley Gangroad or the "Crich Rail-way" was built by Benjamin Outram, to connect the Warner limestone Quarry to the Cromford Canal a mile away at Bullbridge.[7] Contains the oldest known Railway tunnel at Fritchley[8]