(IRN)-An environmental group is touting the fuel saving benefits of the train. In particular, the savings are measured based on the use of the Metra commuter rail system in the Chicago area: 34.8 million of gasoline a year, assuming all the train riders would have made all the same trips by car, with 1.3 people in the car each time, according to the group Environment Illinois. Metra served 77 million passengers in 2008, with ridership increasing an average of 1 percent per year since 2000. Its busiest line, the BNSF line between Aurora and Chicago, carries an average of 63,200...