From memory,
Crossovers:
Piccadilly Delta
Victoria (siding for trams to terminate from city centre direction then reverse)
GMEX
Media City Delta
Between Picadilly Gardens and Picadilly
Turnback sidings:
Timperley
Piccadilly Undercroft (will be moved short distance out of the undercroft when extensions run along present reversing sidings)
Cornbrook (double ended pocket turnback siding) (under construction opening in couple of months)
The two depots, Old Trafford and Queens Road
Terminal Platforms with crossovers
Altrincham
Bury
Eccles (Single platform)
Media City (couple of months)
In a couple more years several more including terminus at Rochdale Station and East Didsbury and Airport. Central Park and St Werburghs will be temporary terminus so presumably trailing crossovers there too,
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Were you asking because the Victoria crossover is being renewed this week?