Barcelona sagrada familia > Barcelona airport, October 2013
Platform heights and train floor heights differ across cities, countries and continents.
Standardisation might stifle design in some areas. Why not design the train and the platform around the users though? Does everyone really board trains with leaps and bounds?
Train and platform makers: revolutionise by working together. Get your users walking, wheeling and gliding on and off your trains world wide.
In Barcelona they have built in a little raised level. St Pancras/Gard du Nord they have not.