Network rail may well own the site now, but the site was originally the site of the swing bridge, this land jutting out into the canal from the east side to significantly narrow it so a swing bridge could span it. This plot still juts out really.
So it would not have been owned by the canal company back then, but ~'roads and highways'

Of course there would have been a lot of land swapping hands when the rail came, but unlike buildings that come and go, land ownership is more stable and I think this site like the strangely shaped william hills site on the corner are relics of a much earlier time.