Two-rail versus three-rail system
Early toy trains A toy train is a toy which represents a train, distinguished from a model train by an emphasis on low cost and durability, rather than scale modeling.
S Track: common American Flyer track is a two-rail system. The modern S-Trax by S Helper service is a roadbed-based track with solid rail that has the same basic curve radius and straight track lengths as tubular track.
Electric current which flows in only one direction. Model railroad power packs for two-rail trains typically input AC (household) current, and convert (rectify) it for output as low-voltage DC current to run the trains.
Dead Man's Control ...
We ordinary folk who power our trains via the two-rail system must think about right rail positive and where we should cut gaps in the rails to avoid problems. I will add the simple diode to the mix.
Trains, structures, scenery, and figures are all placed, painted, and detailed to look real. However, when it comes to track, hi-rail layouts still use three-rail (or two-rail, in the case of S gauge).
Two-Rail - Current is fed along both rails of the track, the rails and wheels being insulated from one another.
Tyre - (American, Tire) Steel band forming the periphery of a wheel on which the flange and tread profile is formed.
 See also: Train, Track, Gauge, Rail, Locomotive
  
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