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Most lines in Melbourne operate under an automatic block system of safeworking with three-position power signalling. This permits [[Railway signal|signals]] to operate automatically with the passage of trains, enforcing the distance between them. At junctions signals are manually controlled from [[signal box]]es, with [[interlocking]]s used to ensure conflicting paths are not set. The [[Flemington Racecourse railway line|Flemington Racecourse line]] has two-position automatic signalling, a variant of the three-position system.
The outer end of the [[Hurstbridge railway line|Hurstbridge line]] used to be operated with [[Token (railway signalling)|token based systems]] and two-position manual signalling, where access to the line is based upon possession of a token. It was dismantled in 2013.
[[Train stop]]s are used to enforce stop indications on signals—should a train pass a signal, the train's brakes will automatically be applied. Trains are also fitted with [[pilot valve]]s, a form of [[dead man's switch]] that applies the brakes should the driver fail to maintain a foot or hand pilot valve in a set position.<ref name="safe">{{cite web
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