York - Sheffield permitted routes

[daniel3982]

Going to head to Sheffield on Monday but just wondering what the permitted routes are? Am I OK to go via Huddersfield as I quite fancy checking out the Penistone Line? And would a conductor be OK with me going this way even though there are several quicker routes?

 

[Oscar]

York - Huddersfield - Sheffield is a valid route using maps TP and SH.