Campaigners in Bradford District have welcomed trains with additional carriages but say the platforms at some stations will be too small.
The Northern rail company confirmed that six-carriage trains will be introduced to the Airedale and Wharfdale lines to ease overcrowding.
However, the Aire Valley Rail Users Group says that whilst the platforms at Keighley, Ilkley and Skipton stations will be able to accommodate them, those at other stops along the routes won't.
Northern said it is working with Network Rail to identify what work may be required.
Plans for new Leeds Kirkgate Market attraction move forward
Big Doggie Do set to return to Milton Keynes
Bradford Council appoints David Watson as new culture and events director
Drug Arrests After Police Raid in Allerton
Appeal after serious collision on Vicar Lane in Leeds
Leeds 400 challenge launched to get city moving
Accrington drug dealer jailed for 10 years
Culture at the Heart of Stockport’s Transformation
South Asian Art Exhibition Opens at Cartwright Hall
Men’s Mental Fitness Programme Launches in Blackburn
Council Calls for Tougher Fly-Tipping Sentences
Alim OnAir
Remix Saturdays
Legal Show
The Golden Era