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File:Grinderman and railgrinder (Montreal, 1912).jpg

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Description
English: A grinderman with his railgrinder. A railgrinder was equipped with two abrasive blocks, seen here in front of the machine on the left side of the photo. These blocks rubbed the tracks to remove irregularities, thus enabling trams to roll along the rails without friction. Due to the railgrinder's low speed, the grinderman usually worked overnight. Like trams, the railgrinder and other rail maintenance vehicles were often powered by electricity.
Date
Source http://www.stmexhibit.info/tramway/picture5.html
Author unknown employee of the Montreal Street Railway Company
Permission
(Reusing this file)
Public domain
This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
1. it was subject to Crown copyright and was first published more than 50 years ago, or

it was not subject to Crown copyright, and

2. it is a photograph that was created prior to January 1, 1949, or
3. the creator died prior to January 1, 1972.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
 Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.

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current13:51, 31 May 2011Thumbnail for version as of 13:51, 31 May 2011940 × 722 (464 KB)DragonflySixtyseven{{Information |Description ={{en|1=A grinderman with his railgrinder. A railgrinder was equipped with two abrasive blocks, seen here in front of the machine on the left side of the photo. These blocks rubbed the tracks to remove irregularities, thus e

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