WR MRVC EMU 1157 is the 1st ever EMU to test the newly energized 25000V AC section in Andheri-Churchgate section. And Up Harbour line is the 1st line to see an EMU testing its AC OHE. This was then followed by 1141-1144 MRVC EMU on UP Fast line, followed immediately by WR Retrofitted 25KV AC EMU 3009-3012 on UP Slow line. (Vijay Aravamudhan)