Heaton Chapel station [HTC] is the busiest station in the whole of Greater Manchester with 837,226 paying passengers in 2016/7, up 10.6% on 2015/6, and still without disabled access. When passengers using travel and bus passes are included, this usage will probably be not far off 1,000,000 passengers per annum.
11 other much less busy local stations all in north Manchester are already being considered for an accessibility updgrade. Probably three will be upgraded by 2019.
The 'Friends' have strenuously campaigned to have HTC included on this list, but sadly to no avail currently.
In reality, 2020 will be the very earliest before HTC can be even proposed for consideration for an upgrade.
HTC needs one new lift down to platform 2 and a new legal ramp down to platform 1.
This data is published on the Office of Rail Regulator Station usage 2012/3 website.
paying passengers % of HTC
Heaton Chapel 654,224 [100%]
Blackrod 573,982 87.7%
Hindley 365,912 55.9%
Walkden 322,590 49.9%
Daisy Hill 279,782 42.8%
Appley Bridge 241,314 36.9%
Irlam 240,440 36.8%
Newton for Hyde 186,504 26.5%
Broadbottom 149,250 22.8%
Swindon 138,058 21.1%
Hyde 69,502 10.6%
Hazel Grove [624,564] and Marple [437,926] in LibDem wards have already been upgraded, even though these two Stockport stations both have a lower footfall.