Are there images available [online] of Bozeman, Montana's streetcars?

Odds are, no. The only definitive book about trolleys and interurbans in Montana is a three volume set by Ira Swett. I beleive this series of books was printed by Interurban Press in the late 1960's, though copies surface now and again. The Bozeman system was linked in later years to the Milwaukee Road.

Even more obscure than the Bozeman system was the Billings system which had battery operated cars. I've only seen two or three photos of that one.