Ambassador (B&M train)

The Ambassador was a named passenger train operated by the Boston and Maine Railroad (B&M) between Boston, Massachusetts, and Montreal, Quebec, Canada. Introduced in 1935, it provided a daytime service connecting these two major cities. The Ambassador was known for its scenic route through the White Mountains of New Hampshire and Vermont's Green Mountains.

The train typically featured coaches, a dining car, and parlor or observation cars, offering passengers comfortable amenities for the approximately eleven-hour journey. As passenger rail travel declined in the mid-20th century, the Ambassador experienced reduced ridership.

Service was discontinued in 1966. The cessation reflected the broader trend of declining rail travel in North America at the time, due to competition from automobiles and airlines.