Horse drawn trams were later adopted because the wheels rolled more easily along the rails, so horses could pull heavier loads (= more passengers) and could get to their destinations slightly more quickly. the ones in these cards used to run on the streets of Belfast in Northern Ireland.
|Royal Avenue, Belfast|
|Castle Place, Belfast|
The Belfast Street Tramways Company first operated horse drawn trams in 1870 until they were bought out by Belfast Corportation in 1905. During that year they were electrified so the pictures must date from before then.
The cards themselves probably date from about 1902, I would say. They do have divided backs but there is space on the front left for messages and it looks as though the "Write Here for Inland Postage only" has been added later.