Outdoor base station antennas give your receiver the advantage of height above ground. Unlike the tiny antenna that often comes in the box. Base station antennas are tuned to the VHF Rail Band from 160 to 161 MHz. If you are serious about listening to the rail band, then one of these antennas are worth a look..
The TrainTenna, on the left and the KB9VBR J-Pole, on the right, are two of the better options.