Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Rather than fitting DDA complient toilets to the 153s, why not remove the toilets completely such as the class 376s with South Eastern, it may limit the uses, but are there really that many journeys of over 57 minutes that just have a single car unit?
There is also scope there to increase...
The "high passenger loading" lines normally publicise their own statistics, I have seen the NYMR do this, the North Norfolk do in their leaflets at the start of each year entitled "what's going on" - If I recall correctly, there were 130,000 passengers travelling on the NNR in 2009.