Cambridge Railroad

[2][3] A further extension to Mount Auburn Cemetery opened soon after, as did a branch to Porter Square.

[5] The Porter Square branch was extended to the border of West Cambridge (now Arlington); there it met the West Cambridge Horse Railroad, which opened on June 13, 1859.

For the first two months, no fares were charged, making the line very popular, with over 2000 passengers per day within a week.

When it started to charge fares, the public was outraged, many calling for the franchises to be revoked.

The mostly-underground Red Line subway opened March 23, 1912 and provided a much faster route from Harvard Square to downtown Boston, but streetcars remained in service for local traffic.