The NY MTA published a very detailed study on its "G" line.  It includes   
   things such as where trains should stop on the platform and where benches   
   should be so as to even car loading.  Since the train uses one person crews,   
   CCTV cameras would have to be    
   relocated if stopping location is changed.   
      
   Anyway, I recommend this document and its appendices for review, not so much   
   for the G line, but to see what is involved in service planning.   
      
   http://web.mta.info/nyct/service/G_LineReview.htm   
      
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