Glasgow, and the London boroughs mentioned, clearly beat Liverpool. But boundaries vary, and some boroughs cover an extremely wide geographical area but a comparatively sparse population: Leeds is an example where the compact city centre (with very few stations) is surrounded by green fields and market towns like Otley, all officially within the 'city'. Even so I can't think that it has more than half a dozen or so stations in total. I don't know if Cardiff's boundaries are similar. Greater Manchester must have many stations – more if those now converted to Metrolink are included – but the city itself is quite small in area. Liverpool similarly is almost entirely urban with the green belt and much of suburbia located in neighbouring boroughs.