PKP's EU07 Bo-Bo electrics can trace their ancestry back to the English Electric AL3, later Class 83, built for BR in 1960-62. EE then supplied 20 Class EU06, based on the AL3 design to PKP. The EU07 was a Polish development of the EU06 and almost 500 were built from 1965-94.
Around 2008 the EU07s started to operate a number of cross border services into Czech territory, including a period when they worked an overnight service between the border and Praha.