Elderly maniacs killing females from a bus

Sorry to bother you, guys, but I need help identifying one more movie. It was probably filmed in the 1970s-90s. At the beginning of the film, a bus is driving along a road in a wooded area. There are a group of women on board, about 5-10 people. There may have been children too. The bus has some kind of breakdown. They pull up to a large house with a fountain. An old man and an old woman live in the house. The bus driver is trying to repair it. Then the murders of the women and the driver begin. At the end of the film, a corpse or body part is shown near the fountain, buried shallowly. The killers turned out to be the old people who lived in the house. Similar to the film American Gothic (1987).

I think it does not match all your details, but at least there are some similarities:

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