"The Promise" by Girls Aloud has a very cryptic message hidden in it.
This revelation came to me when the song was in the charts, I worked 12-hour shifts and the local radio station was apparently playing it every hour 24/7. My reasoning ran something like this:

* The chorus has a train-like rhythm, "pro-mise-to-me pro-mise-to-me / pro-mise-to-me pro-mise-to-me".
* In Morse code, this is .... / .... / .... / .... (H H H H).
* HHH in World War I era radio signals means "halt".
* The rhythm and the Morse code translation suggest a train moving forward but halting as well. Reversing?
* Where on the rail network, apart from the end of a line, does every single incoming train reverse to leave?
* Castleford.

Therefore, "The Promise" has a hidden message related to Castleford. Buggered if I know what that message is though. Probably something banal like "don't work anywhere where you can't escape from Ridings FM".
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Thu 1 Dec 2011, 19:25, 3 replies)

if you listen to the rhythm of the opening bars of 'YYZ' by rush
the two tone motif does in fact, in morse, spell out YYZ, the international call sign of Toronto international airport nearby where they hailed. They've got to try and be more cryptic like Girls Aloud it would seem.
( Rotating Wobbly Hat That's not a banana. THIS is a banana., Thu 1 Dec 2011, 22:10, closed)

It's not just Castleford
The trains all stop in Bradford too (at both stations) and isn't there a Girl Aloud from Bratfud too? The plot thickens... (and The Pulse is just as bad as Ridings FM too!)
(The Inevitable Pelican, Fri 2 Dec 2011, 16:20, closed)

They reverse in Bradford because both stations are physically situated at the end of a line.
The line at Castleford continues beyond it and eventually merges with the ECML, but that section's only used by freight traffic. Or as a diversion if the main Leeds-York line is closed for engineering works.
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Sat 3 Dec 2011, 19:14, closed)