Without the heavy debt load of the original company, the railway turned a regular if small profit in most years. Ridership reached a peak in 1915 and fell steadily thereafter; cost savings through four new lightweight cars and cheaper power kept the company profitable even as the
automobile ate into the company's resort traffic. By 1924, ridership was half the 1915 level. In that year, the company was sold again, to the
Cities Service Corporation, mainly once more for its associated power generating business. The line operated as part of the
Ohio Public Service Company, the name the cars would bear for a further 21 years. The new company painted the cars in high-visibility "traction orange". The extension to Bay Point was abandoned in 1926. Service levels were cut to only six departures from Toledo a day from a high of fourteen as the
Great Depression hit; only three of these traveled the whole line. Single-man operation was adopted to cut costs in 1932. Ridership continued to fall, until in 1938 only 48,900 passengers rode the line, down from 934,055 in the peak year of 1915. The Toledo streetcar line decided in 1939 to abandon the Starr Avenue route through which the now OPS's cars entered the city. Rather than cut back service to the edge of town, the company decided that ridership levels were insufficient to continue passenger operation. The last run was on July 11, 1939. Operation continued as a purely freight carrier.
Less-than-carload (LCL) freight had ceased in 1935, but carload traffic interchanged with the railroads continued. The line interchanged with the
Toledo Terminal Railroad, the
Wheeling and Lake Erie Railway, the
New York Central Railroad, and the
Lakeside and Marblehead Railroad, and did not parallel any of these lines. The majority of traffic was
dolomite from a quarry in the area, and
coal for a
Toledo Edison power plant. == Separating the power and traction businesses ==