Unfortunately after Amtrak left the Fort Wayne Line in 1990, Conrail turned the Pennsy position light signals perpendicular to the track and then switched them off permanently. This is the dual directional signal at milepost 304 in Monroeville, Indiana. Stations The Lima depot sustained fire damage in 1999 and is currently up for sale. If it is demolished then Amtrak could possibly detrain somewhere downtown until a suitable station could be found or constructed. I don't see any reason why Amtrak couldn't just stop in the middle of town, somewhere near the police station.
Public parking is available in many spots downtown.
The platforms outside would likely need to be demolished and rebuilt. In Warsaw the train could stop at the depot or somewhere else downtown. Like Van Wert, no facilities are really needed here other than a pay phone. Valparaiso would need a new station since the original one no longer stands. The Lima depot burned in 1999 and is in very poor shape in 2001.