The Pennsylvania Department of Transportation has identified five potential routes for the revival of intercity rail passenger service to Allentown.
The study chose among 12 potential routes. PennDOT said the study is a roadmap for the process of bringing rail passenger service to the Lehigh Valley.
Two of the routes would link Allentown with New York City, two would link it with Philadelphia and one would link it with Reading, Pennsylvania.
The latter would connect a proposed service between Reading and Philadelphia. The two New York City routes would connect with New Jersey Transit lines.
The direct Allentown-Philadelphia route would require restoration of rail lines that were removed to create hiking and biking trails.
The PennDOT study estimated the cost of bringing rail passenger service to Allentown at between $450 million to $739 million.
The most expensive routes would be the direct routes to Philadelphia.
Service to Allentown was not mentioned in a Federal Railroad Administration corridor identification program released last year.
PennDOT officials said their study is a step toward getting service to Allentown into the FRA program.