Majority of current speed restrictions are due to crossings, turnouts, bridges and other geometry issues, not ties.
Rail Trail tunnel progress. Looking for forward to this. I remember for some time carrying my bike across two sets of tracks. When Amtrak started, I biked around via local streets.
https://trainsinthevalley.org/northampton-underpass/" onclick="window.open(this.href);return false;
Lots of steel work when I biked by a number of times.
Rich