The power is reserved in the members of the board of waterworks commissioners and their successors in office to convey the property hereby conveyed - in case of default in the payment of the bonds or interest coupons provided for in sections 91.090 to 91.300, RSMo, authorizing the city to purchase a waterworks system and issue bonds in payment therefor, as is provided in said sections; that is to say: That in case of default in the payment of said bonds and interest coupons, the property hereby conveyed shall be conveyed by said board of waterworks commissioners by deed of conveyance to the bondholders, to be held by them in the relative proportion that the bonds held by each shall bear to the entire bond issue; provided, that said property may be conveyed to a trustee designated by a majority of the bondholders to be held for the use of all the bondholders in the proportion aforesaid. The power hereby reserved in said board of waterworks commissioners is to be irrevocable, and the city, by the acceptance of this deed, hereby recognizes such irrevocable power in said board of waterworks commissioners for the purpose of securing the payment of said bonds and coupons.
§ 91.130, RSMo