 Trevithick found a heterogeneous fleet of up to 246 steam locomotives of many different designs from very different builders in England, Scotland, France and the USA.This lack of standardisation of locomotives or components complicated both locomotive maintenance and general railway operation.From 1877 to 1888, the ERA struggled to keep up with even basic maintenance but by 1887 Trevithick managed to start a programme to renew 85 of the very mixed fleet of locomotives with new boilers, cylinders and motion.