NV-EC-10-RL part code?

The NV-EC-10 and NV-EC-10-RL are the same product - a 10-port unmanaged switch that delivers fast Ethernet and PoE+ over Coax cable with up to 3,000ft (915m) reach. 

The only difference is that NV-EC10-RL has an IEC line controller in it, to adhere to the Railway installation standards and compliances. Hence, the 'RL' is added to the part code.