Bob,
The quote in the book was that the LNA&C built 4 miles of track north from Dyer to Maynard in 1882. The EJ&E crossing in Dyer is at Milepost 29.0, the Amtrak station in Dyer is at 27.6 and Maynard is 25.4. The "new" Hammond station was at MP21. Seems to me they could quite possibly have had some other arrangement simply based on the mileage from Dyer to anyplace north of South Hammond yard where the connection would be short. The city of Hammond website timeline has always shown the LNA&C not building into the city until 1884.
I am going to have to re-read the Hilton book as well regarding this period. I honestly haven't been that interested in the pre-CI&L period until recently.
Eric