After a short westward stretch through Mirfield, where it runs on the ex-L&YR section, it continues south-west through Huddersfield, using the Colne Valley to its headwaters.It is currently subject to the Transpennine Route Upgrade, which is an element of the Integrated Rail Plan for the North and Midlands that was announced in November 2021.Emphasis was placed on the bi-modal power of the new trains using the line; this necessitated using diesel engines on the unelectrified sections of track.[25] This also saw many of the TPE services diverted away from the Guide Bridge to Manchester Piccadilly corridor, so that through trains could use the newly opened Ordsall Chord.[27] Six trains per hour provided by TPE in both directions run on the Huddersfield line between Stalybridge in Greater Manchester and Leeds:[28] An ale trail has become popular along the route owing to a large number of easily accessed and nationally acclaimed pubs along the route; this includes pubs on the station platforms at Dewsbury, Huddersfield and Stalybridge.The following are of particular interest: The trail featured on the BBC's Oz and James Drink to Britain programme and consequently became very popular for drinkers in Manchester and Leeds.