German railways upgrade their comms tech from 2G to 4G • The Register
GSM-R Bulletin - 45
Amazon.com: XWD QYT GS800G GMRS Mobile Radio GMRS Channels 8 Repeater Dual Band Receiver Walkie Talkie Long Range Two-Way Radios with NOAA Weather : Electronics
Download this document - GSMR Online
Siemens GSM-R Cab Radio - Cellular Modem Information - Open Source Mobile Communications