Most of the small stations on the Hull Scarborough line have low platforms, Arram, Hutton Cranswick, Nafferton, Bempton, Hunmanby. Humps have been put in which at least give one carriage to get out of with out too much of a drop. If you able bodied and get on or off elsewhere its not too bad, but if you are carrying luggage or a bike then its more difficult. Problem is bike area frequently doesn't align with hump. If we are expecting visitors arriving at our local station and know that they have mobilty issues we try and explain which carriage to get into. Equally the wheel chair area doesn't always line up, but the guard seemed to be able to cope on the one occasion I have seen a wheel chair user at our local station. The access is step free, but there is a short but steep slope off the railway property which would be a challenge.
Its just not possible to raise every platform, the cost would be way beyond any benefit, the humps seem to help, but there occasions where its more difficult.