 Competition for the contract was so fierce that it involved last @-@ minute discounts , offers of free parts and allegations of sabotage . Metro @-@ Cammell , Kawasaki and ASEA were shortlisted for the final round . Metro @-@ Cammell based its design on the Hong Kong MTR M @-@ Train EMU and proposed to use the GEC propulsion system had they won the contract . Metro @-@ Cammell also delivered a concept mock @-@ up and was originally the favourite to win the contract . However , analysts became concerned that a measuring error involving the London Underground 1983 Stock during the evaluation period could jeopardise their bid . 
