Complex sentence: This historical line has a low maximum allowed height, sharp curves that force low speeds, and its very poor profile, with a maximum gradient of 30 ‰, forces doubling or tripling the locomotives of freight trains,.
Split into simpler sentences: This historical line has a low maximum allowed height, and sharp curves that force low speeds. Its very poor profile, with a maximum gradient of 30 ‰, also forces doubling or tripling the locomotives of freight trains,.