"The Altoona Works BP4 is a 1,350 hp (1,010 kW) B-B battery-electric locomotive rebuilt by the Altoona Works of the Norfolk Southern railroad. It is the result of a conversion of an existing EMD GP38-type locomotive. This involves replacing the existing prime mover with a set of 1080 12-volt lead-acid batteries, and associated control equipment."@en . . "Altoona Works BP4"@en . .