Here's some information about Parmelee from primary sources.
First, the description from the General Information section of the 7/6/47 B&O System timetable:
Next, a small ad from the 9/27/53 New York Central System time Table.
I rode the cabs many times as a kid transferring between Grand Central and C&NW Stations. I always liked it because I got to ride on a folding jump seat.