Crosby Tunnel

Crosby Tunnel is a tunnel that is located west of Crosby, connecting said town with Knapford. It is one mile in length.
Crosby Tunnel was cut by the Wellsworth and Suddery Railway(W&SR) in 1912 following the agreement made in that year to amalgamate with the Tidmouth, Knapford and Elsbridge Light Railway (TK&ER) to form the Tidmouth Wellsworth & Suddery Railway (TW&S). The tunnel, originally cut for a single line, was opened out for double track in 1915 when the North Western Railway took over the TW&SR.
* Railway Series
* Television Series
=== The Railway Series ===
* Edward the Blue Engine - Bertie's Chase
* Percy the Small Engine - Percy and Harold
* Thomas Comes Home - Snow Problem and Thomas Comes Home
* Wilbert the Forest Engine - Wired-Up (mentioned)
==== Companion Volumes ====
* 1986 - Thomas and the Missing Christmas Tree
* 1987 - Thomas and the Evil Diesel
* 1992 - Thomas and the Hurricane
=== Thomas & Friends ===
* Series 6 - Thomas the Jet Engine
* Series 10 - Thomas and the Shooting Star, It's Good to be Gordon, Sticky Toffee Thomas, Thomas' Frosty Friend and James the Second Best
* Series 20 - Letters to Santa
* Series 21 - Terence Breaks the Ice and Confused Coaches (deleted scene)
* Series 22 - Thomas' Animal Ark
* Series 23 - Chucklesome Trucks, Steam Team to the Rescue!, Diesel Glows Away and First Day on Sodor!
==== Specials ====
* 2018 - Big World! Big Adventures!
==== Music Videos ====
* Big World! Big Adventures! - Where in the World is Thomas?
* Series 23 - Don't Stop
==== Videos ====
* 2019 - Meet the Sodor Construction Company!
* The tunnel has gone through a few changes:
** Series 6:
*** The tunnel had walls on the sides and the tracks were straight.
** Series 10:
*** The walls were removed and the tracks are curved.
** Series 23:
*** A  passing loop and a hill are added on the Knapford side of the tunnel.