I believe that knowledge of railroads (and railfaning) is enhanced when you know more about how the railroads did did it. To that end, there are a number of articles in the memory pages of my Railroads of Madison County web site http://madisonrails.railfan.net that describes how several railroads including the PRR/NYC/PC/CR operated in Indiana in the 40s right to the end of Conrail.
The last subject that I posted was ‘The Use of Tools’ by track gangs is a followup on the
Maurice Lewman’s ‘Communications (or how to railroad without a radio)’ and ‘Track Maintenance’. There is much more there. Just take the Memory Pages link.
I think that you’ll find it worth your while for at least a brief visit. 
Roger
Roger Hensley - madisonrails@railfan.net
== http://madisonrails.railfan.net/ ==
== Railroads of Madison County (Indiana) ==