The MR and GNR already having connections with the Widened Lines, it became convenient to use the route to transfer wagons of goods and coal to the Southern companies. By comparison, the LNWR and GWR used the route via the West London Railway, and the GER used the East London Railway. The method adopted was to run trains from the north to a place on the outskirts of London where there were sidings where the train could be broken up. The wagons destined for places south of the Thames were separated and made into a separate train to run across London to another group of sidings where they could be resorted according to final destination. Originally small groups of sidings were used, such as Kentish Town and West Hampstead on the MR, Holloway and Finsbury Park on the GNR. In the later part of the nineteenth century the amount of traffic outstripped the capacity of such places, and huge new marshalling yards were constructed at Brent Sidings MR and Ferme Park GNR.