this regard is simple and expedient, namely, the presentation of a new rate application to this commission for the proper determination of snch facts affecting its revenues, expenses and services as have occurred since the close of the record upon which our order was based.”
The commission used the 1951 average invested capital of $16,596,600 in coming to its conclusion as to what rate order should be allowed. The testimony before the circuit court disclosed that as of. December 31, 1952, the actual invested capital had increased to $20,297,075, and that the average invested capital for the year 1952 was $18,834,400.
At the commission hearing the company offered proof to sustain its estimate that $1,366,000 would be necessary for maintenance purposes for the year 1952. The commission rejected this proof and instead relied upon its staff expert, Mr. Demorest, who testified in regard to the 1952 maintenance costs as follows:
“This is based on the assumption that the maintenance cost per station in 1952-will be the same figure it was in 1951. I have no way of knowing whether this is a correct assumption. * Any determination I made insofar as maintenance expense for 1952 is concerned merely reflects the average maintenance cost of 1951.”
By refusing to consider the testimony forwarded by the circuit court, the commission refused to consider proof that the actual maintenance expense for 1952 was $1,423,473.
Five items, namely, maintenance, traffic, commercial, general office, and other operating expense, were grouped together in determining operating expenses and totaled $3,684,862.60 for 1951. The testimony before the circuit court, which the commission refused to consider, disclosed that for 1952