I need to build an underground tram system.

[Green_Elite_Cab]

Can you be a little more specific? How will you be using the subway cars? what necessitates the 44" length requirement? I have plans for some rapid transit vehicles (you might need it).

I will tell you that this will be difficult. Subway cars (trams) and other rapid transit vehicles are seldom produced, not enough people buy them. In fact, except for a few mass produced models, most are ridiculously expensive resin kits.

I've seen some very large subway models, but they do not approach that size (44") as an individual car. The largest mass produced subway models are going to be those made by Lionel in O scale (1:48)

For example, check out this Lionel set-

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It is nearly $800, and with all cars combined, it reaches 60" in length. Individually, each car is only about 15"s long.

If you need something bigger, you will have to make it yourself, or you will need to pay someone to make it for you. Subways are just no popular enough to get any sort of modeling support.