90's going north

Electric locos of the UK rail network, including both modern and vintage traction still in mainline use today.
90018 leads 90037 north along the relief line through Cheddington on a late afternoon movement to Crewe TMD-E in December 2014.
EOS-1d MkIV, 95mm, ISO400, f3.2, 1/640

ECML class 91