▁and , ▁until ▁its ▁national isation ▁in ▁ 1 ▁July ▁ 1 8 9 4 , ▁the ▁owner ▁of ▁this ▁line ▁was ▁the ▁Heidel berg ▁Spe yer ▁Railway ▁Company ▁( He idel berg - Spe yer - E isen bahn - G es ellschaft ), ▁but ▁it ▁was ▁operated , ▁along ▁with ▁the ▁Rh ine ▁Railway , ▁by ▁the ▁Grand ▁Duch y ▁of ▁Baden ▁State ▁Railway . ▁With ▁the ▁opening ▁of ▁this ▁line , ▁Schw etz ingen ▁station ▁became ▁a ▁small ▁railway ▁j unction . ▁ ▁The ▁Mann heim - F ried rich sf eld – Sch w etz ingen ▁railway , ▁which ▁branches ▁from ▁the ▁Rh ine ▁Railway ▁to ▁the ▁north ▁of ▁the ▁station , ▁was ▁opened ▁on ▁ 1 ▁June ▁ 1 8 8 0 . ▁ ▁The ▁Schw etz ingen – K et sch ▁tram way ▁was ▁opened ▁by ▁the ▁Rhein ische ▁Sch uck ert - G es ellschaft ▁on ▁ 1 2 ▁December ▁ 1 9 1 0 . ▁An ▁over land ▁tram way ▁was ▁opened ▁in ▁ 1 9 2 7 ▁to ▁Schw etz ingen ▁of ▁the ▁Schw etz ingen – Pl ank stadt – E ppel heim – He idel berg ▁route ▁by ▁the ▁Heidel berger ▁Straßen - ▁und ▁Berg bahn ▁AG ▁( He idel berg ▁Street ▁and ▁Mountain ▁Railway , ▁H SB ). ▁Because ▁of ▁a ▁sharp ▁drop ▁in ▁passenger ▁numbers , ▁the ▁line ▁was ▁closed ▁on ▁ 3 1 ▁March ▁ 1 9 3 8 . ▁ ▁The ▁Heidel berg – Sch w etz ingen