– ) ▁Mann heim ▁H bf – Kar ls ru he ▁H bf ). ▁During ▁the ▁week day ▁peak ▁hour ▁there ▁are ▁service ▁at ▁intervals ▁of ▁half ▁an ▁hour , ▁or ▁even ▁a ▁quarter ▁of ▁an ▁hour . ▁Not ▁all ▁of ▁the ▁additional ▁services ▁start ▁from ▁or ▁end ▁in ▁Kar ls ru he , ▁but ▁instead ▁start ▁from ▁or ▁end ▁in ▁W agh ä us el ▁or ▁Gra ben - Ne ud orf . ▁Some ▁Regional - Express ▁services ▁also ▁run ▁in ▁the ▁peak ▁between ▁Mann heim ▁and ▁Kar ls ru he , ▁stopping ▁at ▁least ▁in ▁Gra ben - Ne ud orf , ▁W agh ä us el , ▁H ock en heim , ▁O fter s heim ▁and ▁Schw etz ingen . ▁During ▁the ▁International ▁German ▁G ymn ast ics ▁Festival ▁( Intern ational es ▁Deutsch es ▁Turn fest ), ▁which ▁was ▁held ▁between ▁ 1 8 ▁and ▁ 2 6 ▁May ▁ 2 0 1 3 , ▁one ▁of ▁two ▁so - called ▁Turn fest z ü gen ▁( G ymn ast ics ▁Festival ▁trains ) ▁ran ▁between ▁Schw etz ingen ▁and ▁Mann heim ▁H bf . ▁ ▁Con ne ctions ▁to ▁urban ▁transport ▁ ▁The ▁Schw etz ingen – K et sch ▁tram way ▁operated ▁from ▁ 1 9 1 0 ▁to ▁ 1 9 3 8 . ▁Between ▁ 1 9 2 7 ▁and ▁ 1 9 7 4 , ▁the ▁Heidel berg - E ppel heim - Pl ank stadt - Sch w etz ingen ▁tram way