Absolutely. The easiest to find and undoubtedly cheapest are the Bachmann Brill and PCC trolley models--these run about $30 and have fairly well-detailed bodies. With some modification they can handle a 6-8" curve.
These modifications are covered in the April 1989 Model Railroader, which was the end-cap for a series called "O'Dell County Traction." The main problems with the Bachmann are the trolley poles (which should be exchanged for more functional ones), the headlights (a bit of lucite leading from a center light, which blocks the free motion of the trucks, can easily be replaced by a simple bidirectional lighting kit), and the frame around the trucks (a little cutting allows for more free movement in the trucks.) But for $30 it's still a nice li'l piece.
There are other relatively low-cost trolley models: Bowser makes a Brill, a PCC and an IRR interurban. Most commercial trolley models will handle those sharp curves--some of the larger interurban cars may have trouble, but if you're just modeling an in-town trolley system you shouldn't have any problem.
Issue 2 in a trolley model is overhead wire. For simplicity you might want to power the trolley in the traditional manner rather than by overhead, but it's nice to at least hang dummy wire. Some trolley modelers who use two-rail power, who want to do it the easy way, even ensure that their trolley poles hang slightly below the trolley wire rather than touching it, to avoid snags. This makes Real Trolleymen gasp with horror, however: Real Trolleys are powered off the wire! But I won't tell if you don't...
Try
www.trolleyville.com, their "Schoolhouse" section includes extensive files on how to hang trolley wire, lay in-street track, and more.
www.eastpenn.org also includes more traction-modeling hints.