by codasd
The shark fins are usually for wireless connectivity. At least on autos.
Railroad Forums
Moderator: MEC407
neman2 wrote: ↑Thu Jun 22, 2023 10:22 am I think you may be right, initially I thought it wasn't PTC because the Stony Brook doesn't have passenger trains, but apparently PTC is required if trains carry certain hazardous materials. Also this doesn't look like the same system the MBTA uses with transponders attached to the ties at key locations.No, there is a plethora of exemptions for PTC, it is not required on the Stony Brook regardless of the hazmat.