English Electric EL.100
 English Electric EL.100 (Polish designations EP01 EL.100 E100 and E01) was a class of electric locomotives used by the Polish State Railways. Originally built and designed by English Electric as a line engine it was used in Poland mainly for shunting as a supplemental engine to ferry steam locomotives across the Warsaw Cross-City Line tunnel between Pruszków and Otwock. It was the first electric locomotive used in Poland.