There are three detectors near Rochester. On the CSX Chicago Line, the main line that runs through downtown Rochester, there is one to the east near Brighton and one to the west near Coldwater. On the West Shore Branch, the bypass line which runs directly from Fairport to near West Chili, there is one near Pittsford. Unless they have been converted by CSX, they will announce “Conrail, Pittsford, New York. No defects. Total axle count 426. Train speed 49” on the road channel. The train will immediately announce “CSX Q-426, no defects” on the road channel. Obviously the announcements will be different if a defect is detected. When CSX modifies them, the detectors will announce CSX and milepost rather than Conrail and placename.

Detectors transmit using very low power. It is intended than they be heard by the crew in the locomotive but not everyone for miles. The Brighton and Coldwater detectors are only 14 miles apart and they cannot be allowed to interfere with each other. Therefore you won’t hear them from very far away unless you have some truly exceptional – read expensive – equipment.

I don’t believe any of the shortlines – Rochester Southern, Livonia Avon & Lakeville, Genessee & Wyoming, Falls Road, Ontario Midland and Ontario Central – have detectors.

For the Chicago line you have the Rochester AMTRAK station at milepost 371.0. There is a HBD-DED at milepost 364.1 called "Brighton" and another HBD-DED at milepost 386.5 called "Churchville". Like dwheeler said there is also one on the West Shore Branch. The West Shore Branch leaves the Chicago Line at milepost 359.2. On the West Shore Branch there is a HBD-DED at milepost 355.8 called "Pittsford".

Down here in Norhtern Virginia I'm around milepost 97 on the RF&P subdivision of CSX's Baltimore Division. I can hear detectors from milepost 84.6, 95.8, and 106.5.