BR (ER) Gresley A4 class no. 60004 William Whitelaw Mick Bayliss Loco commissions, My loco collection 7th January 20187th December 2020 BR (ER) Gresley A4 class no. 60004 William Whitelaw. Built and painted by myself from the excellent Martin Finney kit, with an ABC motor and gears unit and Slaters wheels. Originally built as a commission, but when given the opportunity to acquire it back I couldn’t resist.