Did this stage line operate 1921-1923?

I have a family history of sorts written by my elderly aunt when she was in her 80s. She was 14 years old in 1923 and lived with her parents about 16 mi south of Roundup, then 1-1/2 mi.off the road that ran between Roundup and Billings. (My atlas says this was probably Hwy 87.)

Per her history, she says she went to Roundup in Sept 1923 and lived there to go to school. It lasted only 6 weeks and then the people she was living with put her on "the stage" (late Oct 1923) and sent her back home. She described the stage as being a 2-seater touring car. The driver stopped it in the vicinity of where they lived, she got off, and then walked the 1 1/2 mi. home.

In another part of her history she describes when an aunt who lived in Nebraska came to visit them in 1921, The aunt took the train from Nebraska to Billings, then took "the stage" (a 2-seater touring car) north towards Roundup.

The whole Greenslit family loaded up in their horse and wagon and went the 1 1/2 mi. to the main road, stopped, and waited beside the main road for the stage to show up. It did, the aunt got out and joined them. I assume that's how the aunt got back home.. prob was taken to the main road and waited for the stage to come by heading for Billings.

There is no mention in my aunt's history of a regular "stop" being there on the main road, such as buildings etc.so I don't know if there were regular stops along the way or not. I am wondering if the drivers just dropped you off where you wanted and also if they took on passengers if they stood by the side of the road. Do you have any idea how the stage operation operated?

If your ancestor was a driver in 1921 or 1923, he probably met my ancestors. -- Helen Greenslit Graves