 However locomotive operation caused considerable friction with the existing horse hauliers, who operated the upper part of the line; in addition the weight of the locomotives caused subsidence problems in the weaker parts of the track.In 1855 the Company made a loss, of £548.This was taken hard, although it was brought about by the considerable expenditure on one-off items (charged to current account) — the locomotives and rolling stock, the work on the Wheal Busy extension, and major repairs to the company's steam tug, kept at Devoran.