They run on telephony-based infrastructure such as AMPS or GSM.
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In time, problems with sources of electrical noise showed that frequency modulation (FM) was superior for its ability to cope with vehicle ignition and power line noise.
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Railroads used medium frequency range (MF) communications (similar to the AM broadcast band) to improve safety.
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Early mobile radios used amplitude modulation (AM) to convey intelligence through the communications channel.
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Yaesu has recently entered the APRS market with their VX-8R(G) handheld and FTM-350R mobile radio.
From 1952 to 1966, Kirknewton was home to several small United States Air Force units tasked with providing mobile radio facilities in Britain.