Mo. R. Civ. P. 75.01
Except as otherwise provided in Rule 81.045, the trial court retains control over judgments during the 30-day period after entry of judgment and may, after giving the parties an opportunity to be heard and for good cause, vacate, reopen, correct, amend, or modify its judgment within that time. Not later than 30 days after entry of judgment, the court of its own initiative may order a new trial for any reason for which it might have granted a new trial on motion of a party, and every order granting a new trial shall specify the grounds therefor. After the ..ling of notice of appeal and before the ..ling of the record on appeal in the appellate court, the trial court, after the expiration of such 30-day period, may still vacate, amend or modify its judgment upon stipulation of the parties accompanied by a withdrawal of the appeal.
The 30-day period after entry of judgment for granting a new trial of the court's own initiative is not shortened by the filing of a notice of appeal but is terminated when the record on appeal is ..led in the appellate court or an order shortening this period is entered under Rule 81.045.
Mo. R. Civ. P. 75.01
Committee Note - 1959
This rule is based upon Section 119 of the 1943 Code Section 510.370, RSMo 1959 but the first, third, and fourth sentences are taken from existing Rule 3.25, which permits vacation of a judgment.
Compare: Rule 59(d), Federal Rules of Civil Procedure.