I recommend using an actual railroad radio. These are the same radios the railroads actually use. They are, however, very expensive. Factoring in the radio, cables, and software, you will need at least $300 if not way more. My recommendation is the ICOM F3161DT or DS. It seems to work fine and is used by many rail agencies. I have an F3161DS... I haven't had it for a long time but when I bring it trackside it seems to work fine as long as heavy clothing doesn't obstruct the antenna. It has 512 channels, so that's plenty to monitor your favorite radios. I also have a friend who has a Motorola HT1250. It has good receiving capabilities... and is often seen as better than the Icom. It has 128 channels and is analog only (unlike the ICOM which can receive NXDN digital as well).