The reason why these units were called 'Tadpoles' can be seen in this image with the conventional size EMU vehicle leading and the two narrow Hastings units at the rear,
it was said it resembled a fat body with a long narrow tail.
Image by Tonys Trainz & Buses
Unit 1203 formed disbanded
Vehicle previous unit reformed into
DMBSO 60004 1003 1003
TSOL 60505 1002 1002
DTS 77507 5708 1403