Effect of diesel locomotive operation on atmospheric conditions in a railway tunnel



An extensive study was made over a seven day period to determine if it would be feasible, from an air pollution view point, to operate diesel locomotive powered trains through the St. Clair Tunnel. The test involved the passage of approximately 200 diesel powered freight and passenger trains through the tunnel; 3,000 air samples were taken and measurements were made on air flow and smoke density. Concentrations of carbon monoxide, nitrogen dioxide, total oxides of nitrogen, aldehydes, sulphur dioxide, carbon dioxide and oxygen were determined.

The sampling methods, sampling equipment, analytical procedures and test equipment used for this particular investigation should be applicable to a variety of air pollution problems met in the chemical industry.