And to do that meant creating the flattest gradients that had ever yet been made, which meant building long viaducts across river valleys, this is actually the viaduct across the Thames at Maidenhead, and long tunnels such as the one at Box, in Wiltshire.
Y hacer eso significaba crear las pendientes más planas que jamás se habían hecho, lo que significaba construir viaductos largos a través de valles y túneles largos como el que hay en Box, en Wiltshire.