Original sentence: This proposal was supported by the GMPTE as it would increase useable train paths through Piccadilly by between 33% and 50%; the extra track would, however, require an expensive extension to the Piccadilly-Deansgate viaduct carrying the track from Slade Lane
Edited sentence: This proposal was supported by the GMPTE as it would increase usable train paths through Piccadilly by between 33% and 50%; the extra track would, however, require an expensive extension to the Piccadilly-Deansgate viaduct carrying the track from Slade Lane