FREE INSTITUTE OF SCIENCE 



THE ELIMINATION OF GRADE-CROSSINGS IN CITIES 



21 



2. Lowering the street under the railroad. 



3. Lowering the street and raising the railroad. 



4. Raising the street and lowering the railroad. 



5. Raising the railroad over the street. 



6. Lowering the railroad under the street. 



These methods are shown in a diagrammatic manner in Table 4. 



TABLE 4 



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By an examination of these methods the changes required to the railroad 

 are a minimum in i and 2, and increase in the order given, while exactly the 

 reverse holds good when the changes required for the street are considered. It 

 would also seem that, other considerations being equal, 3 and 4 would affect 

 the railroad and the street equally. 



