On the Napa train, they were seated in small groups across an aisle, making conversation difficult without speaking loudly, she said. A staff member had warned them about noise before they even left the station.

Image Members of the book club after being ejected from the train. Credit... Lisa Johnson

After they were ordered from the train, they had to walk through all of the cars, Ms. Johnson said.

“We obliged, but that was the most humiliating and embarrassing thing I’ve ever experienced in my life,” Ms. Johnson said, adding that some of the women were in tears. “To be paraded through all those cars, all those passengers looking at us, wondering what did we do that was so bad that we were being escorted off that train.”

She added: “All we were doing was laughing, having a good time, and trying to discuss our book.”

Mr. Singer said passengers are removed about once a month. In this case, the women were “disrupting the experience of other passengers,” he said.

“The train’s policy is to remove guests who are disruptive,” he said. “The staff doesn’t enjoy asking guests to depart early, but they take these issues seriously to ensure the safety and enjoyment of all guests.”

The company is reviewing the incident, which involved several complaints from other passengers about the group’s loudness, Mr. Singer said. The women were given free transport back to Napa and full refunds, he said.

The women were further angered by a Facebook post by the Napa Valley Wine Train that accused them of “verbal and physical abuse towards other guests and staff.” The post was deleted but not before Ms. Johnson took a screen shot and later posted it to Facebook.