I would really suggest for you guys at CO to take a good look into the whole "modularity" of trams, metros, and even monorails.
With metros it is possible to "design" custom trains. I won't say that it is implemented well,
but it is possible. You should definitely consider to make custom train length for all 3 rail-based systems.
Since the metro DLC i have 2 options in my mind which both would also fit nice to trams:
1.: Give the player the option to buy trains at custom length. But do not make it as modular as it is now, just buy pre-defined length between 3-8 cars per train (for trams maybe 1-3) and thats it. Like with the Prospecta Royal M/L, which is basicly the same tram. This could be the option for ALL rail-based vehicles. Just have one basic train in the buy-menu and give the player the option to choose the number of cars while buying it.
or
2.: Make it quite similar as it is now with the metros. So the user buys single vehicles (e.g. single Tatra-trams) and then the user can define how many of the vehicle should be used in the
timetable. This makes it easier to dynamically use a number of already bought vehicles (like now with modular metros)
but on the downside you get a really messy depot (sometimes I have hundreds of cars in my metro depot and the window
doesn't even tell me how many I own! (unacceptable!)). And it also makes it nearly impossible to buy and distinctively use different vehicle types in one depot!
So option 2 gives more freedom but also more headaches!
I would normally prefer option 2 (and the current solution for metro-madness); however, with the
current UI I really, really dislike this way of custom trains. It would be perfect with a new UI; however, I know that adapting the UI would be to much of a task for the few resources you guys at CO have and I am okay with this.. Therefore,
I would strongly recommend option 1 for both trams as well as replacement for the current metro-system.
If you are not going to change the current metro-system (I expect this) then at least give us the option to sell all cars at once in a depot and show us how many cars are in the depot, please !
And please add driving trailers at the end of the trains for god's sake
A last question regarding the London Stock: will it be a modular or non-modular train?