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||<Pedant> The locomotive does the pulling. The word you want is train. Some modern passenger trains don't have locomotives at all.
||Baked. People have been traveling in hammocks on trains
since the Crimean War (1st recorded instance), if not
longer. Super-Baked. (ref: _Engines of War_, by Christian
Wolmar, Public Affairs Books, pub.)
||And no, the "synchronized oscillation of masses" would not
cause problems. Think about cattle cars or, for that
matter, troop trains during the Crimean War.