For the purpose of comparison, I am assuming that all the DLR services are run in 3-unit sets, and all the T&W Metro services are run in 2-unit sets. So I have multiplied the published vehicle miles totals by 3 and 2 respectively.
Occupancy per unit - 2015/16 (2014/15)
Docklands Light Railway - 33.9 (34.2)
Croydon Tramlink - 52.6 (55.4)
Nottingham Express Transit - 31.1 (33.8)
Midland Metro - 31.6 (28.6)
Sheffield Supertram - 33.3 (33.1)
Tyne and Wear Metro - 30.5 (28.8)
Manchester Metrolink - 31.0 (36.2)
Blackpool Tramway - 22.5 (22.6)
England average - 33.2 (34.3)
Of course units vary in capacity; but not that much. Interesting that almost all systems are currently carrying around 33 passengers on average per unit - exceptions being Tramlink at over 50, and Blackpool at less than 23.
Metrolink, before its recent trebling in fleet size, was carrying around the same average passenger numbers as Croydon now.
Fare revenue per passenger mile - pence
Docklands Light Railway - 42 (39)
Croydon Tramlink - 22 (22)
Nottingham Express Transit - 27 (33)
Midland Metro - 27 (27)
Sheffield Supertram - 24 (27)
Tyne and Wear Metro - 23 (24)
Manchester Metrolink - 28 (28)
Blackpool Tramway - 45 (50)
England average - 31 (31)
Non-concession fare revenue per passenger mile - pence
Docklands Light Railway - 43 (40)
Croydon Tramlink - 21 (21)
Nottingham Express Transit - 29 (33)
Midland Metro - 28 (28)
Sheffield Supertram - 31 (34)
Tyne and Wear Metro - 24 (24)
Manchester Metrolink - 31 (31)
Blackpool Tramway - 46 (50)
England average - 34 (33)
The most expensive systems to ride on are the DLR and Blackpool. T&W Metro and Tramlink are exceptionally cheap - and both require an operating subisidy. Metrolink is a bit lower than average.
Total Fare revenue 2015/16 £m
Docklands Light Railway - 161.9 (143.8)
Croydon Tramlink - 22.8 (24.4)
Nottingham Express Transit - 13.6 (8.8)
Midland Metro - 8.6 (7.7)
Sheffield Supertram - 11.4 (12.6)
Tyne and Wear Metro - 50.2 (47.9)
Manchester Metrolink - 62.4 (56.8)
Blackpool Tramway - 6.1 (5.6)
Total Fare revenue per trip 2015/16 £
Docklands Light Railway - £1.38 (1.28)
Croydon Tramlink - £0.84 (0.76)
Nottingham Express Transit - £1.11 (1.09)
Midland Metro - £1.79 (1.75)
Sheffield Supertram - £0.98 (1.10)
Tyne and Wear Metro - £1.25 (1.26)
Manchester Metrolink - £1.82 (1.82)
Blackpool Tramway - £1.24 (1.37)
England average - £1.34 (1.28)
Fares per trip in London have been increasing; while most other fares have been frozen (Manchester, T&W) or have gone down a bit (Blackpool, Sheffield)