A frog war occurs when one private railway company attempts to cross the tracks of another, and this results in hostilities between the two railways. It is named after the frog, the piece of track that allows the two tracks to join or cross and is usually part of a level junction or railroad switch.

The Shubenacadie Canal is a canal in central Nova Scotia, Canada. It links Halifax Harbour with the Bay of Fundy by way of the Shubenacadie River and Shubenacadie Grand Lake. Begun in 1826, it was not completed until 1861 and was closed in 1871. Currently small craft use the river and lakes, but only one lock is operational. Three of the nine locks have been restored to preserve their unique fusion of British and North American construction techniques. More extensive restoration is planned.